FL/Fl_Packscroller: Cleanup event behavior. Eliminate unnecessary vertical padding.
Mixer: Set a default upper bound on module parameters of 1 in case the module (LADSPA Plugins in particular) doesn't specify one.
Mixer: Increase font size for fader value.
Timeline: Fix offset of drag and drop file imports.
Implement drag and drop for making/breaking JACK connections in Non Mixer and Non Timeline.

(Drag jack output module and drop on jack input module of another strip)

In Non Mixer, all JACK modules (including Aux) will now list their connections.
Mixer: Fix some button handling.