quotes 5.x-1.6

#154279 by NancyDru for bennyfio - set random blocks to noncachable.
#262623 by NancyDru for c-c-m - corrected some missing t's.
#262632 by NancyDru for c-c-m - added author biography feature.
#262635 by NancyDru for c-c-m - fixed author field setting after bios addition.
#265272 by NancyDru for TallDavid - fixed error on timed blocks.
#270812 by NancyDru for scotese - decode HTML special characters.
Add CSS file to suggest formatting.
Add permissions link in help for general settings page.
Minor correction to css to prevent weird formatting in blocks.

NOTE: The new author bios feature changes the table schema. You must run update.php before doing anything else. You may also notice SQL errors due to blocks; these will go away after running the update.

Authors' biographies are added on a new "Bios" tab in settings page.