zsh completion improvements. File completers now correctly deal with filenames that contain spaces. The completers also use 'hg status .' so they'll work correctly when the default behaviour changes.

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/