Many bug fixes:

- A linked knob to an animated knob now has its curve type set
appropriately
- Bug fix in the SequenceDialog that would remember bad sequences names.
- Linkage of knobs is now PER dimension (as well as copy/paste value)
- Reworked the stylesheets to make it more appropriate when a knob is
linked.
Merge branch 'workshop' of https://github.com/MrKepzie/Natron into workshop

Conflicts:
	Engine/OfxParamInstance.cpp
	Gui/KnobGuiTypes.cpp
	Gui/Resources/Stylesheets/mainstyle.qss