- Replaced "Root/Bin" by "Active/Inactive" on all displays of the tree
  model. Internally, in the db, we mantain "Root/outside" terminology;
- Forced alternate row colors of preview tables, by using the QPalete;
- Filtered 'n/a' ocurrences on the preview table, and all comboboxes from
  frframe;
- Removed all DBs, apart from FAOCASDATA;
- Corrected "Instead of Update Trigger" for FR_Time, since it was wrongly
  testing for a change in FR_time.ID, rather than FR_TIME.ID_FRAME