dispatch: make "_checkshellalias()" invoke "findcmd()" with "strict=True"

Before this patch, shell alias may be executed by abbreviated command
name unexpectedly, even if abbreviated command name matches also
against the command provided by extension.

For example, "rebate" shell alias is executed by "hg reba", even if
rebase extension (= "rebase" command) is enabled. In this case, "hg
reba" should be aborted because of command name ambiguity.

This patch makes "_checkshellalias()" invoke "cmdutil.findcmd()"
always with "strict=True" (default value).

If abbreviated command name matches against only one shell alias even
after loading extensions, such shell alias will be executed via
"_parse()".

This patch doesn't remove "_checkshellalias()" invocation itself,
because it may prevent shell alias from loading extensions uselessly.

--HG--
branch : stable
doc: fix mistake about matching against directories in "pattern.txt"

This fixes mistake of documentation about matching against directories
in "pattern.txt" introduced by 50db996bccaf.

".hgignore" treats specified "glob:" pattern as same as one specified
for "-X" option: it can match against directories, too.

For reference, extra regexp string appended to specified pattern for
each types are listed below: see also "match.match()" and
"match._regex()" for detail.

  ============= ========== ===============
  type          cmdline    -I/-X
  ============= ========== ===============
  glob/relglob  '$'        '(?:/|$)'
  path/relpath  '(?:/|$)'  '(?:/|$)'
  re/relre      (none)     (none)
  ============= ========== ===============

Appending '$' means that the specified pattern should match against
only files.

--HG--
branch : stable
dispatch: take --hidden from individual commands into account

The command server would otherwise ignore that option, since the repo
object is only created once.

--HG--
branch : stable
convert: use branchmap to change default branch in destination (issue3469)

The fix for issue2653 broke the ability to map the default branch of a source
repository to a non-default named branch in the destination repository.  Leave
the default behaviour as is, but allow the branch name "None" to be used to map
to a non-default named branch in the destination repository.

--HG--
branch : stable
clone: do not turn hidden changeset public on publishing clone (issue3935)

Before this changeset local clone of a repo with hidden changeset would include
then in the clone (why not) and turn them public (plain wrong). This happened
because the copy clone publish by dropping the phaseroot file entirely making
everything in the repo public (and therefore immune to obsolescence marker).

This changeset takes the simplest fix, we deny the copy clone in the case of hidden
changeset falling back to pull clone that will exclude them from the clone and
therefore not turning them public.

A smarter version of copy clone could be done, but I prefer to go for the
simplest solution first.

--HG--
branch : stable