Brief list of changes in stable's OTA-4. Bear in mind there is much more changes in the update because of the baseline switch from 14.09 to vivid. This is also the reason why this changelog has much less detailed information than the previous ones. Most important changes: - Change of the base distribution from 14.09 to vivid * This also means differences in the toolchain and libaries * For easy comparison: 14.09 was based on a pre-utopic system - Further improvements to location accuracy - MMS group-chat support - Oxide 1.7.8 with multiple fixes and improvements - Welcome wizard code now in Unity8, different tutorial design - Ubuntu UI Toolkit 1.2: * New ListItem with fancy features * New UbuntuShape rendering properties * New header design - Qt 5.4 - New monochromatic indicator icon design - Scope tagging to be used by the scopes aggregator - Importing SIM contacts - Full fix for reboot loops caused by segfaults in log.c code - Multiple common crash fixes - Most up-to-date core-applications (dialer, webbrowser, messaging, address-book)