Update form/field/usergroup.php

Delete the commented out section in the getRepeatable() method that is confirmed not applicable to this FOFFormFieldUsergroup class. This is a housekeeping commit as the there is no net effect on what the code does. Also effected is form/header/usergroup.php, which will be deleted.
Delete form/header/usergroup.php.

Delete this file as it is not called by /form/file/usergroup.php::getRepeatable(). This is a housekeeping commit as there is no net effect on what the code does.
Handle empty and default calendar values
Merge pull request #289 from roland-d/calendarDefault

Handle empty and default calendar values
Merge pull request #288 from bbloom/fixusergroupfield

Fixusergroupfield
Close #290
Merge pull request #292 from akeeba/feature/290-update-transparent-auth

Close #290
Close gh-296
Move definition of form_class

If you don't show headers or filters then you get a notice 
Notice: Undefined variable: form_class in \joomla32\libraries\fof\render\strapper.php on line 675
Merge pull request #297 from wilsonge/patch-1

Move definition of form_class
Docblock typo
Documentation update
Created a new method that cleans the current object and clones it
Close #294
Merge pull request #298 from akeeba/feature/294-fix-table-reset

Close #294
Updating COmposer
Updated the administrator area
Update bin folder
Update components folder
Update includes folder
Update layouts folder
Updated the libraries folder
Updated root files
Merge pull request #299 from akeeba/feature/update-environment

Joomla 3.2 update