Fix documentation of -I and -X options. These options apply to all names, not just to directories. In other words, you can do something like this: hg add -X 'f*' '*.c' and it will have the effect of "add all files matching *.c, except those starting with f".

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.