Merge pull request #528 from Hoffi1/master

Update of Event/Mailer/JEM/Script.php + update sql
removed echo
Update jem.php

removed echo
try to merge Hoffi1/develop into jemproject/development
Merge pull request #534 from Hoffi1/develop

More things for 1.9.5: ACL view access + archive button fix
Merge pull request #533 from jemproject/development

Nice fixes/enhancements from Hoffi for JEM 1.9.5
  - delete obsolete files on update (issue #275)
  - alter catids and myattending url in menu table and catids in module table when crossing 1.9.4 -> 1.9.5 border
  - correct mailer plugin (issue #522)
  - change 'el*' to 'jem*' in search plugin to allow searching in EL and JEM at same time
  - ACL view access - support Joomla access levels instead of single gid
  - fix archive button creation (in case old events are not configured to move into archive)
Added mod_teaser to package xml file
Cleaned code #514
Added new modules to package description
Fixed list ordering when sorting by date #509
Fix indentation, cleanup
Various fixes in Help section:
- Removed gmapsoverlay from credits
- Removed "ACL not yet implemented"
- Fixed numerous Typos
- Fixed several HTML validation errors
Fixed image links from absolute to relative paths.
Did not work with Joomla installations in subdirectories.
Removed width/height attributes
Shortened and cleaned up help CSS file
Add .pointer block to jem.css - issue #537
insert legend "Recurrence"
Help section HTML changes
Cleanup, fixing errors, etc
Added and corrected obsolete files
Added javadoc
Revert "removed obsolete event-table"

This reverts commit 6058e4c62b45e81bce08ced7375d50d9d96473ba.
Added tables/jem_events back, as it is still needed for EL import to
work properly