add preoutgoing and outgoing hooks. preoutgoing lets prevent pull over http or ssh. outgoing lets notify after pull.

i forgot to change the test output for test-hook.

tests for new hooks. fix things i found when writing tests.

fix test-help diff options.

merge with crew.

add -p option to tip. for issue 64.

add prechangegroup and pretxnchangegroup hooks. prechangegroup lets you stop push, pull or unbundle before it begins. pretxnchangegroup lets you inspect changegroup before transaction is committed, and roll back if you not like it.

merge with crew.

add -w and -p options to diff. this is for issue 126.

fix names of parent changeset ids in hooks. fix hook part of man page.

prefix hook env var names with HG_. old names are still provided, but doc says they deprecated.

merge with crew

add a -b/--branch option to 'hg parents'

Fix diff against an empty file (issue124) and add a test for this.

catch errors and throw exception with invalid binary patch data