[ci skip] Pre-release cleanup

[ci skip] Pre-release cleanup

[ci skip] Remove phpdoc.dist.xml from package

[ci skip] Update CI_VERSION constant

Update CI_VERSION

Fixing two broken links in the User Guide.

Really fix bcit-ci#1715

Merge branch 'hotfix/2.1.2'

Retagging 2.1.1 for version number corrections

Readded PDO drivers.