Move commands.forget over to using new walk code.
With no names, it now recursively forgets everything, as is the default
behaviour of other commands. And prints the names of all files it
hasn't specifically been told to forget.
+ mkdir t
+ cd t
+ hg init
+ echo This is file a1
+ echo This is file b1
+ hg add a b
+ hg commit -m 'commit #0' -d '0 0'
+ echo This is file b22
+ hg commit '-mcomment #1' -d '0 0'
+ hg update 0
+ rm b
+ hg commit -A '-mcomment #2' -d '0 0'
removing b
+ yes k
+ hg update 1
this update spans a branch affecting the following files:
b
aborting update spanning branches!
(use update -m to perform a branch merge)
+ exit 0