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now each plugin can say whether it can be disabled or not. defaults to true

NEEDS TESTING!!!

The only places in Mahara that don't want this are upgrades, which I
changed as well.

(cherry picked from commit 66ee3c5506c7f15acb9ce172d1d6cf8add34a582)

Removed a commented out method that hasn't been necessary thus far.

Change to earlier fix for View access positioning problem (bug 3041) which moved submit buttons in Firefox

You'd think this would never happen, but it can if a page is defined as PUBLIC and has the sideblock on it.

Throw SystemExceptions rather than Exceptions when files can't be found to be included in safe_require.

When uploading files with only digits in the extension, append more digits on clash rather than trying to preserve the extension