hg status: added options to select files by status. Added options -m, -a, -r and u to select files corresponding to status M, A, R and ? respectively. If none of these options are specified, files of all status will be shown.

+ hg init
+ hg add a
+ hg commit -m first -d 0 0 a
+ hg add sub/b
+ hg commit -m second -d 0 0 sub/b
321
+ hg co 0
cat: sub/b: No such file or directory
ls: sub: No such file or directory