Update the mySQL class to use PDO functions.
Modify mySQL class to allow execution of prepared statements.
Change all queries involved in home page to use prepared statements.
Replace mysql_real_escape_string with PDO prepared statements.
Remove code which has been commented out since 2010

This is in the git history in case anyone needs to refer to it.
Remove more long commented-out code that uses non-parameterized SQL
Modify how insert IDs are retrieved to sanity check they are numbers, and cast accordingly.
Remove redundant variable declarations.
Reinstate fatal database error message, rather than debug output.
Use PHPUnit group tags to make excluding Xapian-dependent searches easier.
Merge branch 'database-improvements'
Fix broken retrieval of person by Guardian Aristotle ID.
Remove the suppression of errors causing PHPUnit hard failures.
Replace deprecated \e modifier in preg_replace with preg_replace_callback