Eloy's comments from MDLSITE-425

Well, I've executed the comparison script with today's HEAD against 3 months ago HEAD and I've got these strings deleted since then:

< blog.php:addotags
< blog.php:addptags
< blog.php:otags
< blog.php:ptags
< countries.php:CS
< countries.php:FX
< countries.php:KO
< countries.php:TP
< countries.php:WA
< countries.php:ZR
< grades.php:aggregationcoefextrahelp
< grades.php:aggregationcoefweighthelp
< grades.php:configbulkcheckboxes
< grades.php:configquickfeedback
< grades.php:errornocategorizedid
< grades.php:overallavg
< moodle.php:nostatstodisplay
< userkey.php:keyiprestrictionhelp
< userkey.php:keyvaliduntilhelp

About these strings... we should test each one to see if they are used in old stable branches:

1) If they are used in stable branches... (say 3 latest branches 1.7, 1.8 and 1.9?) then we must reintroduce them ASAP.
2) If they aren't used, they they only have been in HEAD so, it's safe to keep them deleted, IMO.