Author: Petr Škoda
MDL-36959 rework adding of content files to the file pool
This patch includes refreshing of borked files in file pool and basic prevention of race conditions. It also helps with diagnosing of file pool permission problems, detects coding errors and some other type of problems including sha1 collision jackpot.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d91e2c15dbd501231e37efb338418d6b9014bc0c
http://github.com/moodle/moodle/commit/d91e2c15dbd501231e37efb338418d6b9014bc0c
+ 2.5 en [storedfilecannotcreatefile,core_error]