The 'Show Sliders' option for DopeSheet and Graph Editors now works again. When this option is enabled (it is disabled by default), a slider (or combobox) is shown beside the mute/lock toggles for F-Curves. Editing the slider will result in a new keyframe being added on the current frame. So, for all the (ex)-Maya animators out there, you can now animate in a channelbox-like way. :) Also in this commit: * Fixed some warnings in modifier.c from previous commits there * Fixed some refresh problems with DopeSheet channel list (which were only obvious after adding back the sliders) * Removed the old/unrestored and nasty slider code used in the past by the Action Editor only.