Enhance the query planner to exploit transitivity of join constraints.

FossilOrigin-Name: 38852f158ab20bb4d7b264af987ec1538052bec3

diff --cc manifest
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--- 1/manifest
--- 2/manifest
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@@@ -1,5 -1,5 +1,5 @@@
- C Improved\serror\smessages\son\sthe\sRTREE\svirtual\stable.\s\sMake\sthe\s"fs"\svirtual\ntable\sused\sfor\stesting\savailable\son\swindows.
- D 2013-01-17T17:05:28.012
 -C Add\sthe\sability\sto\sdisable\stransitive\sconstraints\susing\sthe\s\nsqlite3_test_control(SQLITE_TESTCTRL_OPTIMIZATIONS)\sinterface.
 -D 2013-01-17T16:43:33.274
++C Enhance\sthe\squery\splanner\sto\sexploit\stransitivity\sof\sjoin\sconstraints.
++D 2013-01-17T17:20:49.316
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@@@ -1033,7 -1034,7 +1034,7 @@@ F tool/vdbe-compress.tcl f12c884766bd14
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