CVS log for loncom/interface/loncommon.pm

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Keyword substitution: kv
Default branch: MAIN
Current tag: version_2_7_0

- Hide escaped course categories from display in "Set Course Environment".
- Add hidden tags in pop-up window which contain unescaped category names.
- When choices are saved to main window, set the contents of the "readonly"
  textbox to the concatenation of the selected category names
- The complete string of (escaped) full category IDs is saved to a hidden form
 element.
- When echoing the saved categories to the user, show only the unescaped names
  joined with ' & '.