make plg_finder_jem J! 3.x compatible
(working on both, Joomla 2.5 + 3.x)
Merge remote-tracking branch 'remotes/origin/development' into dev21

Conflicts:
	plugins/plg_finder_jem/jem.xml
alter code regarding "potential backward compatibility issues in Joomla 3"

things like
- db query -> execute()
- JRequest -> JInput
- JemModelAdmin to wrap prepareTable() conflict
and more

Note: Not fully tested, especially install/update untested yet!
Merge remote-tracking branch 'remotes/origin/development' into dev21
Fix #844 - JInput::getArray(/*no params*/) works since J! 3.2 only
Merge remote-tracking branch 'remotes/origin/development' into dev21
backend: Change 'filter' to 'filter_type' (#842)
backend: if searching by category show all categories of resulting events
Alter backend css to get it more acceptable on Isis template,
also set package version to 2.1-dev002
Merge remote-tracking branch 'remotes/origin/development' into dev21
Add 2.1.0.sql
Merge remote-tracking branch 'remotes/origin/development' into dev21

Conflicts:
	package/pkg_install.php
	site/models/myattendances.php
Merge remote-tracking branch 'remotes/origin/development' into dev21

Conflicts:
	admin/tables/event.php
	site/helpers/helper.php
Fix tooltips on J! 3.3+ using hasTooltip (#846)
backend: minor changes regarding import, radio buttons, order column in lists
frontend: better styling of filters, edit forms, show status column icons
package version set to 2.1.0 RC1

- checked on J! 2.5 and J! 3.3 beez3 + protostar
Merge remote-tracking branch 'remotes/origin/master' into dev21
calendars: option to use category color as event background color (#863)

(two new texts on admin language file)
Fix #866: export date range handling, open dates, new language strings