Added to documentation.
Merge branch 'develop' of git://github.com/openwebwork/pg into develop
Merge branch 'develop' of git://github.com/openwebwork/pg into develop
If a problem value is negative, then don't display points (used in library browser).
Merge branch 'develop' of git://github.com/openwebwork/pg into develop
Merge pull request #69 from jwj61/develop

Hiding point values in library browser