Changes from 1.91+ to 2.0alpha:

• Ported LimeSurvey to use the CodeIgniter PHP framework (magiclko,dionet)
• Advanced way to create conditions/piping/micro-tailoring based on equations by using the Expression Manage (EM) engine (tmswhite)
• Auto-generate Relevance Equation from Conditions when save question (tmswhite)
• GUI for ExpressionManager (tmswhite)
• A real installer (magiclko)
• CodeMirror UI editor now used when editing templates  (magiclko)
• $lwcdropdowns setting removed from config-defaults.php and moved to Advanced question settings for List with Comment question type (c_schmitz)
• Ability to make last minute changes in the survey activation screen to settings that cannot be changed after activation anymore (c_schmitz)
• Export multiple survey archives at the survey list as one big ZIP file (c_schmitz)
• Export survey ZIP archive function with includes the survey structure, responses, tokens and timings - can be used for archival purposes or to move a survey from one server to another. (c_schmitz)
• Global setting to restrict the languages being available in administration or frontend (c_schmitz)
• Implemented mass actions in surveylist which allows to delete/expire several surveys at the same time - only available to super administrators (c_schmitz)
• In deactivation screen you can choose now between deactivation and expiration (c_schmitz)
• Multilingual question attributes (c_schmitz)
• New RemoteControl 2 XML-RPC interface (instead of the old SOAP interface) (c_schmitz)
• Randomization groups for question groups (c_schmitz)
• Reorder questions/question groups per Drag-n-drop (c_schmitz)
• Show modified question attributes at question summary (c_schmitz)
• URL params for integration of survey panels (c_schmitz)