updated changes file for the 1.8.15 release
Rewrote PHP coding standard w/r/t PSR-2
Fixes #5409: Adds visible :focus styles for nearly every link/input
Allow :focus to match buttons as well as anchors
Darker outline on rss/bookmark
cleaned up comments and spacing in database class
removed unused private function
better name for running select queries
more cleanup of db code
deprecate unused function
stop running trim when escaping strings
Fixes #5424 not showing more link on a non-faceted search page
Fixes #5405 fixes fatal error
Fixes #5401 using description if excerpt is not set
Fixes #5421 fixes some encoding issues where wrong context was used
Fixes #5418 adds enabled clause for annotations
not sure what a flush() is doing there
moves database verification code into db class
removed some globals
cleaned up some private db functions