change locate to use relglobs by default
This makes its default behaviour useful again (issue108), and
changes it search the entire repository by default (instead
of just the cwd), just like all other commands.
It also hides issue204 by default, but you'll still see the
same behaviour if you give it a relpath: pattern.
% file replaced with directory
adding a
% should fail - would corrupt dirstate
abort: file named 'a' already in dirstate
% directory replaced with file
adding a/a
% should fail - would corrupt dirstate
abort: directory named 'a' already in dirstate
% directory replaced with file
adding b/c/d
% should fail - would corrupt dirstate
abort: directory named 'b' already in dirstate