Modify several extensions to use the new exported function naming.  Fix some shared library compilation issues.
Modify several extensions to use the new exported function naming. 
Fix some shared library compilation issues.
Adjust the costs in the xBestIndex function of the spellfix1 virtual table
to force the use of the MATCH term if it is available.
Run progress callback checks less frequently in the main VDBE evaluation
loop.  This makes up for the extra CPU cycles used to increment the cycle
counter for SQLITE_STMTSTATUS_VM_STEP.