[#9062] Fix problem loading multiple xPDOQuery driver classes
[#7452] Fix sql errors with decimal fields in some locales

In locales where the decimal is a comma, PDO incorrectly binds the value using the locale output of a float, causing a column count mismatch error in the SQL. This is worked around by forcing the binding type to PDO::PARAM_STR for floats.

Users binding float values to decimal columns manually may need to do the same to avoid issues in locales using the comma decimal separator.

See https://bugs.php.net/bug.php?id=64132 for details on the related core PDO bug.
Bump version for xPDO 2.2.6-pl release
Merge branch 'release-2.2' into develop

* release-2.2:
  Bump version for xPDO 2.2.6-pl release
Merge remote-tracking branch 'xpdo/develop' into develop

* xpdo/develop:
  Bump version for xPDO 2.2.6-pl release
  [#7452] Fix sql errors with decimal fields in some locales
  [#9062] Fix problem loading multiple xPDOQuery driver classes