got rid of remaining calls to "wwerror". Fixes bug #530.
Fix bug from last fix, and a second bug caused by $Global::htmlModeDefault being accidentally called $Global::htmldisplayModeDefault in this file.
Some sites use only one display mode. In that case, the "choice of one" display mode should not be displayed.
incorporate some of davide Cervone'e changes Arnie
remove unneccsary shebang lines Arnie
Bringing these files in sync with the latest versions in the courseScripts CVS --Mike
moved PG modules and macro files from webwork-modperl to pg -sam
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