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Backing out previous change. There is still a serious problem with this file, although we hadn't fixed it.
Fix a bug where problems produce a pink screen on checking answers. We don't bother evaluating the student answer if it is empty.
Fixing docementation so that it can be read from the web.
Added rungeKutta4 method to PGnumericalmacros.pl Updated documentation on rungeKutta4a, an answer filter in PGdiffeqmacros.pl
level_curve_check now forces the use of the old style (not Parser::Legacy) answer evaluators resolving bug 820.
Commenting out unused code. This file still needs a lot of work.
Changed documentation spacing
moved PG modules and macro files from webwork-modperl to pg -sam
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