Author: John Beedell
MDL-67545 Antivirus: new option for clam scan failure
http://git.moodle.org/gw?p=moodle.git;a=commit;h=7aa3444d72a3223bcce754bcac38150647e5709b
http://github.com/moodle/moodle/commit/7aa3444d72a3223bcce754bcac38150647e5709b
+ 3.9 en [antivirusfailed,antivirus_clamav]
+ 3.9 en [configclamfailureonupload,antivirus_clamav]
+ 3.9 en [configclamtryagain,antivirus_clamav]