cygwin: add cygwin specific normcase logic in cygwin environment, mount point part of path is treated as case sensitive, even though underlying NTFS is case insensitive. this patch preserves mount point part of specified path, only if it is absolute one. there is no easy way to get list of current mount points from python program, other than to execute "mount" external command, because cygwin does not store current mount points into Unix/Linux like /etc/XXXtab file. so, this patch introduces cygwinmountpoints variable to list mount points to be preserved case. this allows some other extensions to customize mount point configuration.

icasefs: avoid path-absoluteness/existance check in util.fspath() for efficiency 'dirstate._normalize()', the only caller of 'util.fspath()', has already confirmed exsistance of specified file as relative to root. so, this patch omits path-absoluteness/existance check from 'util.fspath()'.

icasefs: retry directory scan once for already invalidated cache some hg operation (e.g.: qpush) create new files after first dirstate.walk()-ing, and it invalidates _fspathcache for fspath(). then, fspath() will fail to look up specified name in _fspathcache. this causes case preservation breaking, because parts of already normcase()-ed path are used as result at that time. in this case, file creation and writing out should be done before fspath() invocation, so the second invocation of os.listdir() has not so much impact on runtime performance.

push: propagate --new-branch and --ssh options when pushing subrepos Up until now the all the push command options were ignored when pushing subrepos. In particular, the fact that the --new-branch command was not passed down to subrepos made it not possible to push a repo when any of its subrepos had a new branch, even if you used the --new-branch option of the push command. In addition the error message was confusing since it showed the following hint: "--new-branch hint: use 'hg push --new-branch' to create new remote branches". However using the --new_branch flag did not fix the problem, as it was ignored when pushing subrepos. This patch passes the --new-branch and --ssh flags to every subrepo that is pushed. Issues/Limitations: - All subrepo types get these flags, but only the mercurial subrepos use them. - It is no longer possible to _not_ pass down these flags to subrepos when pushing: * An alternative would be to introduce a --subrepos flag that should be used to pass down these flags to the subrepos. * If we did this, it could make sense to make the --force flag respect this new --subrepos flag as well for consistency's sake. - Matt suggested that the ssh related flags could also be passed down to subrepos during pull and clone. However it seems that it would be the "update" command that would need to get those, since subrepos are only pulled on update. In any case I'd prefer to leave that for a later patch.

phases: implement ``phase()`` and ``hidden()`` method for workingctx Working ctx don't have revision number and need a dedicated implementation.

Add a phases.new-commit option to control minimal phase of new commit this option is both intended for human and internal code usage.