Added test for relative paths and all status flags for 'hg status'

Added test for the currently broken addremove with the expected output.

fix locate broken since 63799b01985c - fix the keyword arguments for walk in commands.locate - implement 'hg locate -r <rev>' - add a test for 'hg locate'

Restored old behaviour for 'hg co' and 'hg co -C' for removed files.

Adjusted all but one test output for the new behaviour of localrepo.changes()

Distinguish removed and deleted files. Tests are not fixed yet. hg status will now show "R filename" for "hg rm"ed files and "! filename" for files which were deleted manually. Manually deleted files are considered unmodified.

Renamed c, a, d, u to modified, added, removed, unknown for users of changes()

Make localrepo.changes() internally distinguish between removed and deleted.

Cleaned up localrepo.changes()

Cleanup of indentation, spacing, newlines, strings and line length