[TYPO3-core] RFC: Feature Request #7150: Add pageUnavailable_handling for system problems and maintenance

[Jeff Segars]

Hey guys,

This is a SVN patch request.

Type: Feature

Bugtracker references: http://bugs.typo3.org/view.php?id=7150

Branches: Trunk

Problem:
When a site has database connection problems or other major system 
issues, the only option is for a default error message to be displayed. 
   Likewise, there's not an easy way to temporarily bring a site down 
for maintenance.

Solution:
Add pageUnavailable_handling, which is equivalent to the 
pageNotFound_handling that already exists in core.  This allows custom 
maintenance pages that automatically appear and disappear when a site is 
broken.  It's also possible to click one checkbox in the All 
Configuration section of the Install Tool to manually disable a site 
during upgrades or maintenance.
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