Block regions show region names even when not editable

[Manoj Solanki]

In certain situations where a student may be in editing mode on a course page for example and then goes to the front page, the block regions are not editable, but they still show the region names. Fix this so they do not show region names if the user doesn't have permission to edit the block regions.

[Manoj Solanki]

Fix #809. Ensure block region names etc do not show when user cannot edit layout of frontpage.

→ <<cset fe4e02e89af2>>