Add some timing tests to the amatch test script.
Fix a minor typo in a comment in where.c.
Change the ".dump" command in the command-line shell so that it COMMITs
if there are database corruption errors but invokes ROLLBACK on any other
kind of error.
Add the "fast_vacuum.c" demonstration program to the tool/ subdirectgory.
Fix comments in the fast_vacuum.c demonstration program.
Allow multi-token phrases to load doclists from the database incrementally. This allows queries that feature such phrases to benefit from the "docid<?" optimization.
Merge trunk changes with this branch.
Add a test to check that the new multi-token phrase optimization is actually helping.