CRM-15723 Joomla 3 Footer Bar Overlay

Fix issue with the Joomla 3 admin footer overlaying the action buttons
File adjustments per Coleman

Make changes to the file based on feedback from Coleman
More changes

Changes I missed the first time because of cut and paste.
Merge pull request #4718 from crusonweb/CRM-15723

CRM-15723 Joomla 3 Admin Footer Overlays Action Buttons
CRM-15713 - Case ajax fixes
CRM-15713 - CRM_Case_BAO_Case::accessCase - Split off from getCases().

This allows us to explicit control over more parameters (eg case_status_id)
and to improve performance (by focusing on the specific $caseId).
Merge pull request #4729 from totten/colemanw-CRM-15713

CRM-15713 - Case ajax fixes
Update version to 4.5.6
CRM-15741 - CiviContribute - Don't crash when an ACL-limited user runs Contribution Summary report
Merge pull request #4746 from yashodha/CRM-15741

CRM-15741 - CiviContribute - Don't crash when an ACL-limited user runs Contribution Summary report
Registration Confirm page fails with discounted priceset CRM-15730 fix
Merge pull request #4747 from jitendrapurohit/CRM-15730

Registration Confirm page fails with discounted priceset CRM-15730 fix