rebase: don't mark file as removed if missing in parent's manifest (issue2725)

windows: use win32.unlink in unlinkpath() os.unlink fails to remove files with READONLY attribute

win32: remove READONLY attribute on unlink

windows: move unlink to win32.py no code change

ui: label prompts, default to yellow prompts

record: replace poor man's if-statement with real if-statement

url: use url.url in hidepassword() and removeauth()

subrepos: use url.url when normalizing repo paths This works around an issue in older versions of Python that would strip double slashes from SSH URLs when using urlunparse() on a parsed URL. Related issues: - issue1755: WinXP: cmd line hg 1.3 clone of subrepo fails, due to %5C '\'? (originally fixed by f783bb979fb3).