gitk: Fix GIT_TRACE issues

Check if GIT_TRACE env var is set and unset it if it is.

If the environment var GIT_TRACE=1 exists gitk will fail when trying
to find gitdir:
$ git rev-parse --git-dir
trace: built-in: git 'rev-parse' '--git-dir'
.git

Other git commands will also show debug output hence not work as
intended.

Signed-off-by: Aske Olsson <askeolsson@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Merge branch 'da/gitk-reload-tag-contents' of git://github.com/gitster/git
to get two commits from David Aguilar.
Merge branch 'da/gitk-reload-tag-contents'

After overwriting a tag with a new tag, "Reread references" action
in "gitk" correctly moved the marker in the display, but it failed
to discard a cached contents of the tag (even "Reload" didn't).

* da/gitk-reload-tag-contents:
  gitk: Rename 'tagcontents' to 'cached_tagcontent'
  gitk: Teach "Reread references" to reload tags
  gitk: Avoid Meta1-F5
Merge git://ozlabs.org/~paulus/gitk

* git://ozlabs.org/~paulus/gitk:
  gitk: Fix GIT_TRACE issues
Merge branch 'kk/maint-for-each-ref-multi-sort' into maint-1.7.11

"git for-each-ref" did not honor multiple "--sort=<key>" arguments
correctly.

* kk/maint-for-each-ref-multi-sort:
  for-each-ref: Fix sort with multiple keys
  t6300: test sort with multiple keys
Merge branch 'jk/maint-http-half-auth-push' into maint-1.7.11

Pushing to smart HTTP server with recent Git fails without having
the username in the URL to force authentication, if the server is
configured to allow GET anonymously, while requiring authentication
for POST.

* jk/maint-http-half-auth-push:
  http: prompt for credentials on failed POST
  http: factor out http error code handling
  t: test http access to "half-auth" repositories
  t: test basic smart-http authentication
  t/lib-httpd: recognize */smart/* repos as smart-http
  t/lib-httpd: only route auth/dumb to dumb repos
  t5550: factor out http auth setup
  t5550: put auth-required repo in auth/dumb
Merge branch 'jc/maint-doc-checkout-b-always-takes-branch-name' into maint-1.7.11

The synopsis said "checkout [-B branch]" to make it clear the
branch name is a parameter to the option, but the heading for the
option description was "-B::", not "-B branch::", making the
documentation misleading.

* jc/maint-doc-checkout-b-always-takes-branch-name:
  doc: "git checkout -b/-B/--orphan" always takes a branch name
Merge branch 'jc/dotdot-is-parent-directory' into maint-1.7.11

"git log .." errored out saying it is both rev range and a path when
there is no disambiguating "--" is on the command line.  Update the
command line parser to interpret ".." as a path in such a case.

* jc/dotdot-is-parent-directory:
  specifying ranges: we did not mean to make ".." an empty set
Merge branch 'jc/apply-binary-p0' into maint-1.7.11

"git apply -p0" did not parse pathnames on "diff --git" line
correctly.  This caused patches that had pathnames in no other
places to be mistakenly rejected (most notably, binary patch that
does not rename nor change mode).  Textual patches, renames or mode
changes have preimage and postimage pathnames in different places in
a form that can be parsed unambiguously and did not suffer from this
problem.

* jc/apply-binary-p0:
  apply: compute patch->def_name correctly under -p0
Merge branch 'maint-1.7.11' into maint
Further merging in preparation for 1.7.12.1

Describe the following in the draft release notes:

 . jc/apply-binary-p0
 . jc/dotdot-is-parent-directory
 . jc/maint-doc-checkout-b-always-takes-branch-name
 . jk/maint-http-half-auth-push
 . kk/maint-for-each-ref-multi-sort

Yet to be merged before 1.7.12.1 are:

 . jk/config-warn-on-inaccessible-paths
 . jk/maint-quiet-is-synonym-to-s-in-log
 . mz/cherry-pick-cmdline-order

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'js/compat-mkdir'

Finishing touches to recently added wrapper for mkdir() that do not
want to see trailing slashes.

* js/compat-mkdir:
  Document MKDIR_WO_TRAILING_SLASH in Makefile
Merge branch 'js/compat-itimer'

Pieces to support compilation on __TANDEM.

* js/compat-itimer:
  Add a no-op setitimer() wrapper
Merge branch 'kd/cvsimport-avoid-invalid-tag'

"cvsimport" tried to create a tag taken from CVS without
sufficiently sanitizing it, causing the import to fail when an
invalid character in the tagname made underlying "git tag" to fail.

* kd/cvsimport-avoid-invalid-tag:
  cvsimport: strip all inappropriate tag strings
Merge branch 'nd/log-n-doc'

* nd/log-n-doc:
  doc: move rev-list option -<n> from git-log.txt to rev-list-options.txt
Merge branch 'nd/maint-remote-remove'

* nd/maint-remote-remove:
  remote: prefer subcommand name 'remove' to 'rm'
Merge branch 'sb/send-email-reconfirm-fix'

* sb/send-email-reconfirm-fix:
  send-email: initial_to and initial_reply_to are both optional
Merge branch 'jc/maint-checkout-fileglob-doc'

Updated with help from Peff.

* jc/maint-checkout-fileglob-doc:
  gitcli: contrast wildcard given to shell and to git
  gitcli: formatting fix
  Document file-glob for "git checkout -- '*.c'"
Merge branch 'maint'
Start merging the sixth batch for 1.8.0

Signed-off-by: Junio C Hamano <gitster@pobox.com>