Introduce `arc inlines`

Summary: This displays all inline comments attached to a revision in a format consumable by editors.

Test Plan: Ran it, opened the file on the line.

Reviewers: epriestley

Reviewed By: epriestley

CC: vii, aran, Korvin

Differential Revision: https://secure.phabricator.com/D2845
Fix help message for arc tasks --status
Merge pull request #40 from phleet/patch-2

Fix help message for arc tasks --status
[arcanist] add system arc config file

Summary:
Adds a system arc config file with precedence below the user config
file, both to ArcanistWorkingCopyIdentity::readConfigFromAnySource()
and to base commit resolution.

Test Plan:
[14:48:45 Mon Jun 25 2012] dschleimer@dev4022.snc6 ~/devtools/arcanist
arcanist system_config 21245 $ cat /etc/arcconfig
{
    "base": "literal:foobar"
}
[14:52:31 Mon Jun 25 2012] dschleimer@dev4022.snc6 ~/devtools/arcanist
arcanist system_config 21246 $ ./bin/arc get-config base
(system) base = literal:foobar
(global) base =

[14:52:39 Mon Jun 25 2012] dschleimer@dev4022.snc6 ~/devtools/arcanist
arcanist system_config 21247 $ ./bin/arc which --show-base --base 'arc:system'
foobar

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T1233

Differential Revision: https://secure.phabricator.com/D2854
[Arcanist] fix scratch dir for svn >= 1.7

Summary:
svn 1.7 got rid of the per-direcotry .svn dirs in favor of a single
.svn directory under the root of the working copy.  Unfortunately, we
relied on ther being a .svn directory at the same level as .arcconfig,
which may or may not be at the root of the working copy.  We now walk
up the directory tree until we find a .svn directory that we can use
for scratch files.

Test Plan:
[16:27:52 Mon Jun 25 2012] dschleimer@dev4022.snc6 ~/data/admin/facebook/scripts/db
db  21298 $ ls -la .arcconfig .svn ../../../.svn/arc/config
ls: .svn: No such file or directory
ls: ../../../.svn/arc/config: No such file or directory
-rw-r--r-- 1 dschleimer users 239 Jun 25 16:15 .arcconfig

[16:27:54 Mon Jun 25 2012] dschleimer@dev4022.snc6 ~/data/admin/facebook/scripts/db
db  21298 $ ~/devtools/arcanist/bin/arc set-config --local foo bar
Set key 'foo' = 'bar' in local config.

[16:29:40 Mon Jun 25 2012] dschleimer@dev4022.snc6 ~/data/admin/facebook/scripts/db
db  21298 $ ls -la .arcconfig .svn ../../../.svn/arc/config
ls: .svn: No such file or directory
-rw-r--r-- 1 dschleimer users 239 Jun 25 16:15 .arcconfig
-rw-r--r-- 1 dschleimer users  20 Jun 25 16:29 ../../../.svn/arc/config

[16:29:43 Mon Jun 25 2012] dschleimer@dev4022.snc6 ~/data/admin/facebook/scripts/db
db  21298 $ cat ../../../.svn/arc/config
{
  "foo" : "bar"
}

[16:29:48 Mon Jun 25 2012] dschleimer@dev4022.snc6 ~/data/admin/facebook/scripts/db
db  21299 $ ~/devtools/arcanist/bin/arc get-config foo
(global) foo =
(local) foo = bar

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T1411

Differential Revision: https://secure.phabricator.com/D2856
Simplify "arc branch" and make it work in immutable history repositories

Summary:
  - Move "arc branch"-specific code to the branch workflow.
  - Instead of doing "git rev-parse", just do "git branch --verbose --abbrev=40".
  - Use revision owners to identify ownership, not working copy identity. Particularly with the advent of "Commandeer", you might not own commits you made.
  - Do a batch lookup for commits by hash (depends on D2859, but doesn't break without it).
  - Use PhutilConsole for console stuff.
  - Removed color from "arc list" for the moment.
  - The "--by-status" flag has a slightly different output format now.

Test Plan: Ran "arc branch" in various circumstances, verified it identifies branches in immutable history repositories.

Reviewers: btrahan, vrana, jungejason, nh, slawekbiel

Reviewed By: slawekbiel

CC: aran

Maniphest Tasks: T693

Differential Revision: https://secure.phabricator.com/D2860
Add various flags to the HgProxy daemons

Summary:
  - Add flags to exit after an idle time or client count.
  - Add flags to control daemonization.
  - Add flags to control output.
  - Add flags to skip the "hello" frame of the protocol.
  - Make the client launch a server if one does not exist.

The one-time overhead to launch a server and run a command through it looks to be ~130% of the overhead to run the command directly with "hg", so even if we never run a second command we're not paying too much.

The incremental overhead to run subsequent command appears to be less than 3% of the overhead to run the command directly with "hg" (and maybe less than 1%, I'm not sure how long the computation part of a command like 'hg log' "actually" takes).

The overhead to launch a PHP client, connect to an existing server, run a command, and then print it and exit is roughly 50% of the overhead to run the command directly with "hg". So theoretically a user can achieve an amortized 2x performance increase for all 'hg' commands by aliasing 'hg' to the PHP client in their shell.

Test Plan:
  - Ran servers with idle and client count limits, let them idle and/or hit their connection limits, saw them exit.
  - Ran foreground and background servers.
  - Ran a daemon server with redirected stdout/stderr. Verified logs appeared.
  - Ran with --quiet.
  - Ran clients and servers with and without --skip-hello, things work if they agree and break if they disagree. The throughput gain on this is fairly small (maybe 5%?) but it seems simple enough to keep for the moment.
  - Ran serverless clients and verified that servers launched the first time, were available subsequently, and relaunched after 15 seconds idle.

Reviewers: csilvers, vrana, btrahan

Reviewed By: csilvers

CC: aran

Differential Revision: https://secure.phabricator.com/D2680
Merge branch 'master' of http://github.com/facebook/arcanist