Cherrypick the changes for enhancement requests [e090183531fc27474] 
(use indices on LIKE with no wildcards) and [4711020446da7d93d993]
(use nocase index for LIKE even if the column is binary) into the
3.6.23.1 release of the Apple-OSX branch.
Cherrypick the incremental_vacuum bug fix ([255f1eefa373153942c67b18b]) into
the apple-osx 3.6.23 branch.
Cherrypick the R-tree invalid shadow-table big fix of
[7f2f71cc9e3c39093f09231f44] into the apple-osx 3.6.23 branch.
Backport the very lastest R-Tree in order to take advantage of its enhanced
robustness to corrupt databases.