Add exception class for repository errors
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Add exception class for repository errors
This gives friendlier errors for repo exceptions
manifest hash: f3bef1ddb0c3911b9866ebdafa1fe72df48c8ecd
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+ hg init
+ echo '[hooks]'
+ echo 'precommit = echo precommit hook'
+ echo 'commit = echo commit hook: $NODE'
+ echo a
+ hg add a
+ hg commit -t test -u test -d '0 0'
precommit hook
commit hook: acb14030fe0a21b60322c440ad2d20cf7685a376