view .hgtags @ 1583:32a4e6802864

make mercurial look in more places for config files.

now it searches <install dir>/etc/mercurial, /etc/mercurial, and user
hgrc.

this allows site-wide configuration to be shared over automounted nfs
partition, instead of chenging on every system.  option of having local
configuration on every system remains.

old code for searching /etc/mercurial/hgrc.d never worked, this code
is tested and works.

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