Size reduction and performance improvements in btree.c and the

allocateSpace() routine.  Also fix an assert() in freeSpace().

FossilOrigin-Name: 121308fa869ad490a6924798d276c0ff32759acc

diff --cc manifest
index bee5fb1b5521d1cae0bf306bc60b4d7dac2a8ca6,7a156440dc5f9f625c4929af12eea2f8e99f9dd3..c03b96d1a8e34b64b6cf6005fc13cec234e2f0fd
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Add\sSQLITE_API\smacros\sin\sfront\sof\sinterface\sroutines\sin\sthe\stest_intarray.c\nextension.
- D 2014-08-20T13:25:06.147
 -C Change\san\sassert()\sadded\sby\sthe\sprevious\scommit\sinto\sa\stestcase().\nFix\sa\sseparate\sassert()\sin\sbtree.c:freeSpace().
 -D 2014-08-20T13:17:43.884
++C Size\sreduction\sand\sperformance\simprovements\sin\sbtree.c\sand\sthe\nallocateSpace()\sroutine.\s\sAlso\sfix\san\sassert()\sin\sfreeSpace().
++D 2014-08-20T13:35:45.034
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  F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
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diff --cc manifest.uuid
index bf670ea860ff25d79918372ce88896f189b0446c,4a04c24fb14c8aa390eb36f24d74b053c83e85ac..aa49654c6a42c6e2bb249cb4150499a9b14fafa8
--- 1/manifest.uuid
--- 2/manifest.uuid
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@@@ -1,1 -1,1 +1,1 @@@
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