Bulk Operation

MDL-13303 improve perf and fix groups code on forum index page

MDL-13303 add bulk preloading of all course module contexts in get_fat_modinfo()

MDL-13303 fix print_user_picture to use full user object to prevent 1 db query per image - all code base

MDL-13303 rewrite caching in forum cron

MDL-13303 get_role_access() static cache in cron only

MDL-13303 skip disabled modules and blocks in cron

MDL-13303 use cached system context in get_user_access_sitewide

MDL-13303 add static cache for timezone info

MDL-13303 add static cron cache into format_text() to prevent some db access

MDL-13303 add option to skip logging of blocked emails in forum cron

MDL-13303 pass full user object into when printing user pictures in forum cron

MDL-13303 major memory leak in forum cron in static cache for subscribed users