simplify filterfiles when filtering based on a directory
since an unkown files cannot be an exact match, we bisect
for a <path>/ instead of <path> and we get only the files
below the directory.
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
removing b
this update spans a branch affecting the following files:
b
aborting update spanning branches!
(use 'hg merge' to merge across branches or 'hg update -C' to lose changes)