Changed to dimm non-visible grades (mods). Bug #378. Done a bit more:   - Show dimmed entire column.   - Difference html (for web) and text (for .xls and .txt export) in     many variables.   - Using the dimmed_text style to dimm.
Changed to dimm non-visible grades (mods). Bug #378.
Done a bit more:
  - Show dimmed entire column.
  - Difference html (for web) and text (for .xls and .txt export) in
    many variables.
  - Using the dimmed_text style to dimm.

dilawar/moodle