Fixing error when deleting document see BT#6642
Minor - adding form URL.
Minor - hiding unused CatchScreenCasts link.
Minor - format code.
Fixes mysql error see BT#7078
Fixes bad parameter.
plugin de TIcket
implementando constante __DIR__
continue with the standardization of code
Minor - code styling for tickets management plugin - refs #6715
Updated table names, table indexes and uninstall procedure  for tickets management plugin - refs #6715
Removed useless settings and updated English terms  for tickets management plugin - refs #6715
Update filenames  for tickets management plugin - refs #6715
Minor - adding footer.
Minor - fixing php notices
Using jqgrid instead of old table see BT#6770
Minor - format code.
Drh can enter to a course as an student see BT#6770 a setting in configuration must be set before.
Minor - improving code.
Adding active filter see BT#6770