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.
include hg
recursive-include mercurial *.py
include hgweb.cgi hgwebdir.cgi
include hgeditor rewrite-log
include tests/README tests/run-tests tests/test-*[a-z0-9] tests/*.out
prune tests/*.err
include *.txt
include templates/map templates/map-*[a-z0-9]
include templates/*.tmpl
include doc/README doc/Makefile doc/*.txt doc/*.html doc/*.[0-9]
recursive-include contrib *
include README
include CONTRIBUTORS
include COPYING
include Makefile
include MANIFEST.in