Revert "Changed the credit terminology to scoring."

This reverts commit c6f4adc69eeaf27cb21ada587a6a6cd96a802a90.
Revert "Changed how the reduced credit checker works.  It now has a date provided to it (rather than a reduced credit scoring period)."

This reverts commit 788e39a324435a4dd6be2ab1314113b31cc4173b.
-  Added check for undefined variable in unionTables.pl
Merge branch 'release/2.9' of https://github.com/openwebwork/pg into bugfixes

Conflicts:
	macros/unionTables.pl
Merge pull request #128 from goehle/bugfixes

Bugfixes