Merge pull request #578 from Hoffi1/feature/page-heading

Feature/page heading - issue #566 first views
Fix PHP error introduced with code for #577
Added "protected" modifier to functions beginning with underscore
Added "public" modifier to constructors
added country-default to editvenue (front), FIX #580
added Geocomplete to credits
removed obsolete js-files
adapted/cleaned front helper
fix deprecation SetAttribute, venue-view (backend)

FF was showing that SetAttributeNode & CreateAttribute were outdated so
it's been updated.
altered geostyle.css (width)
added css for table-attachments
moved group-select into fieldset (category, backend)
removed style from attachments pages
altered reference to country-function

instead of pointing to the helper it's pointing to the countries class
Altered/cleaned front-helper a bit more.
bit reordering language strings (backend)
cleanup output.class
altered reference to scriptfiles (editevent, venue)
added static to country functions
altered reference to countryflag function

it's now referring to the country helper
changed timezone function