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

#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

#264151 file descriptor for the install, patched by tsekhar. #289615 suppress message on scheduled backup, patched by greggles

Cleaned up whitespace, implemented some unit and functional testing, fixed some edge case bugs uncovered by unit testing and fixed compatiblity with IMCE regarding file downloads

#238031 potential fix for issue where backup dir is locked but there was no warning. Also some comment cleanup.

#208215 restore and delete not working when files directory is specified with an absolute path. reported and investigated by skizzo and AntoineLafontaine

#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

#195706 configurable timestamp format on scheduled backup, #202207 empty backup files when downloaded. thanks xushi