#548810 Wrong variable name used to call download function resulting in wrong mimetype for downloads

#479060 fixed. Manual Cron Run Causes is_dir

#326370 log noise caused by access check
#360014 relese cron semaphore after retore
#369888 add language to readme about perms

Meaningless comment style change because when I commited the fix for #311346, I forgot to thank eMPee584 for the patch

#295244 untranslatable strings thx rastatt. #289263 prefixes in table listing defaults and missing quote around variable name by greggles

Ported from 5: whitespace cleanup, #264151 by tsekhar, #289615 by greggles, edge case bugs and IMCE compatibility

#233065 log noise during restore on mysql 4.0 and #279788 fixed incompatiblity with poormanscron which caused an infinite loop of http requests

Ported #208215 (restore not working for root relative files) and #209659 (watchdog logging for operations) from the 5.x branch

#193862 unable to write to backup directory when files dir is specified relative to the server root. thx to josedazag for initial report, dugh for finding the problem and wizian for finding the fix