Fixes #3291 : add a 'displayPriority' attribute, with high or low value,
that determines if a section should be displayed by default or not

Fixes #3291 : fixing remarks
Merge pull request #8 from ncharles/ust_3290/dev/3291_implement_hiddable_sections

Refs #3291 : add a 'foldable' attribute, with true or false value, that ...