avoid unnecessary copy merges

white space and line break cleanups

Merge with crew.

Use nullrev+count instead of count-1 in a newly introduced expression. Before that repo.changelog.tip() was used, but this yields a node. Of course many more places should be changed like this, this was just done as an example.

commands.docopy: pay attention on whether paths use "/" or os.sep

fix util.pathto All users of this function pass a local path (which uses os.sep) as the first argument and a "/"-separated path as the second argument.

don't use readline() to read branches.cache The posixfile_nt class used on windows doesn't have that method.

merge with upstream

zsh: typo in commit completion

issue228: Fix repositories at the filesystem root (/ or C:\) Thanks to Robert Shaw and other people on the list for the suggestions.