Merge pull request #21 from chamilo/1.9.x

1.9.x
Merge pull request #22 from chamilo/1.9.x

1.9.x
Merge pull request #23 from chamilo/1.9.x

1.9.x
Merge pull request #24 from chamilo/1.9.x

1.9.x
Merge pull request #25 from chamilo/1.9.x

1.9.x
fixes for exercises -refs #6533
Indentation
Indentation
Fixing bug verifying if forum category exists before create a forum -refs #6695
Minor -format code.
Minor - fixing PHP warnings.
Merge
Allow exercise edition even if it's added in a LP, "dangerous" fields are freezed  BT#7174
Fixing PHP warning + format code.
Adding isset for content, action and id and minor changes -refs #6695
Minor changes
Aiken import, language variable fixed, BT#7159
Merge pull request #182 from cesarperales/1.9.x

Aiken import, language variable fixed, BT#7159
Clean up socialmanager::display_user_list(): better shorter check for bad params - loosely refs #6888
Fix misalignment issue in whoisonline when showing more users - refs #6888