doc/hgrc.5.txt: add anchors for sections Enables links into hgrc.5.html of the form: hgrc.5.html#section

merge from crew-stable

gendoc: add anchors for commands Enables links into hg.1.html of the form: hg.1.html#command

mq: add correct documentation for qpop

Backed out changeset ff5ef3c0fe10 (fixes wrong documentation)

Slight improvement to qpop arguments help

test-mq: update qdiff summary output

mq: make qselect fail properly on an empty guard

mq: expand help text for qdiff Thanks to Waldo for thinking about this and formulating some text.

status: refactor status command - directly calculate a list of states to show - simplify repo.status call - use zip to build file list - only add relevant copies to copy dict

match: cleanup match classes a bit

match: remove files arg from repo.status and friends

match: remove files argument from patch.diff

match: use match.files() for patch.diff