[PATCH] Check for .hgrc files in ancestor directories above the repository

[Jesse Glick]

Maxim Dounin wrote:
> At least the problem will manifest itself when working under  
> other user's home for some reason.

Then the .hgrc will be owned by another user and thus automatically 
ignored. For example, if root on Solaris created /.hgrc for some reason, 
you would see a warning when doing an Hg operation as another user:

Not trusting file /.hgrc from untrusted user root, group root

and the file would not be used.