Fix dirstate.changes for ignored directories. Do a second walking pass to examine any leftover files in the dirstate map that are in the .hgignore file but match our search criteria. This fixes the case of entire directories never being examined due to their presence in the .hgignore file, and should hopefully not add any significant overhead.

syntax: glob

*.elc
*.orig
*.rej
*~
*.so
*.pyc
*.swp
*.prof
tests/*.err
build
dist
doc/*.[0-9]
doc/*.[0-9].{x,ht}ml
MANIFEST
patches
mercurial/__version__.py

syntax: regexp
^\.pc/