Reduce size of critical section and remove call of user-defined functions in

Teodor Sigaev <teodor@sigaev.ru>

Commit: 10dd8df68e6c826186b9900b703051b46ccd6b31
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2006-05-10T09:19:54Z
Releases: 8.2.0
Reduce size of critical section and remove call of user-defined functions in
insertion and deletion, modify gistSplit() to do not use buffers.

 TODO: gistvacuumcleanup and XLOG

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