Provide better context for custom Python encode/decode filters.
While some can function with just some text and an optional command name,
others may want a repository object, a ui object, and a file path.
Use the enhanced information to good effect in win32text.dumbdecode's warning.
syntax: glob
*.elc
*.orig
*.rej
*~
*.mergebackup
*.o
*.so
*.pyc
*.swp
*.prof
tests/.coverage*
tests/annotated
tests/*.err
build
contrib/hgsh/hgsh
dist
doc/*.[0-9]
doc/*.[0-9].gendoc.txt
doc/*.[0-9].{x,ht}ml
MANIFEST
patches
mercurial/__version__.py
Output/Mercurial-*.exe
.DS_Store
tags
cscope.*
syntax: regexp
^\.pc/