Backed out changeset 2ab464771b7d15c60014996d2853efc92cdb8465 - it always runs chmod - uses chmod in an unsafe way - if somebody does a clone of a repo, runs 'make tests', everything is fine, so he can assume the original repo is fine, too, but it is not.

%% Should show unknown
? unknown
removing b
%% Should show unknown and b removed
R b
? unknown
%% Should show a and unknown
a
unknown