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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%% Should show unknown

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? unknown

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%% Should show unknown and b removed

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R b

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? unknown

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%% Should show a and unknown

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a

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unknown