GIT 0.99.7b

Contains the following post-0.99.7a fixes:

 - commit walker performance fix, mostly during walking commits in a
   downloaded packfile, thanks to Sergey Vlasov.
 - squelch unnecessary alarming error message from fetch and clone over
   rsync transport, when remote repository does not borrow anything from
   other repositories.
 - documentation was not rebuilt before installation, noticed by Randal L
   Schwartz.
 - fetching of objects over http transport got a bit safer.
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