purge: avoid duplicate output for --print (issue4092)

Now "hg purge -p" commands avoids printiing duplication of filenames.

Second patch is the test coverage of first patch which tells that '-p'
does not depend on whether ui.verbose is configured or not,that means it
is independent of '-v'.
hgweb: ensure isdirectory is None for repositories, replacing any True value

Until now, repositories did not provide any value for isdirectory in rows
produced for the index output, and thus isdirectory was generally evaluated as
None for each index entry representing a repository.

However, directories (visible when viewed with the descend and collapse
settings enabled) did provide a value of True and this value appeared to
persist in subsequent rows processed by the templater, causing isdirectory
tests in templates to produce incorrect results for index entries appearing
after directories.

This patch asserts the None value for repositories, thus erasing any such
persistent True values.
pull: close peer repo on completion (issue2491) (issue2797)

When pulling changes from a compressed bundle Mercurial first uncompresses it
to a temporary file in .hg directory. This file will not be deleted unless
the bundlerepo (other) is explicitly closed.

This is similar to cleanup that occurs after incoming.
coal: hgweb style adds extra blank line in file view (issue4136)

Now hgweb style='coal' adds no extra blank in file view.
merge: move merge state file path into a constant

We are about to change the format. Having the file path in a single place make
it easier to update the filename for the new version.
merge: change the merge state serialisation to use a record based logic

The format of the file is unchanged. But we are preparing a new file with a new
format that would be record based. So we change all the read/write logic to
handle a list of record until a very low level. This will allow simple plugging
of the new format in the current code.
merge: introduce new format for the state file

This new format will allow us to address common bugs while doing special merge
(graft, backout, rebase…) and record user choice during conflict resolution.

The format is open so we can add more record for future usage.

This file still store hexified version of node to help human willing to debug
it by hand. The overhead or oversize are not expected be an issue.

The old format is still used. It will be written to disk along side the newer
format. And at parse time we detect if the data from old version of the
mergestate are different from the one in the new version file. If its the same,
both have most likely be written at the same time and you can trust the extra
data from the new file. If it differs, the old file have been written by an
older version of mercurial that did not knew about the new file. In that case we
use the content of the old file.
merge: record the "other" node in merge state

We need to record the merge we were merging with. This solve multiple
bug with resolve when dropping the second parent after a merge. This
happen a lot when doing special merge (overriding the ancestor).
Backout, shelve, rebase, etc. can takes advantage of it.

This changeset just add the information in the merge state. We'll use it in the
resolve process in a later changeset.
merge: infer the "other" changeset when falling back to v1 format

When we have to fallback to the old version of the file, we infer the
"other" from current working directory parent. The same way it is currently done
in the resolve command. This is know to have shortcoming… but we cannot do
better from the data contained in the old file format. This is actually the
motivation to add this new file format.
merge: add "other" file node in the merge state file

This data is mostly redundant with the "other" changeset node (+ other changeset
file path). However, more data never hurt.

The old format do not store it so this require some dancing to add and remove it
on demand.
resolve: use "other" changeset from merge state (issue4163)

We can use the "other" data from the recorded merge state instead of inferring
what the other could be from working copy parent. This will allow resolve to
fulfil its duty even when the second parent have been dropped.

Most direct benefit is fixing a regression in backout.
merge: audit the right destination file when merging with dir rename
Added tag 2.9.1 for changeset b96cb15ec9e0
Added signature for changeset b96cb15ec9e0
paper: overlapping of section title on help pages (issue4051)

Now there will be no overlap lines between various section title
on help pages. http://selenic.com/repo/hg/help/config
phase: say "Returns 0" instead of "Return 0" like other command help