TimeEvent view on top of Timebox and without vertical line
Timebox smallView and model observe mutually their position. Moving a Timebox is now constrained by the size of plugin Scenario.
TimeEvent View and model observe mutually their position. Moving a TimeEvent is now constrained by the size of plugin Scenario.
Linked Timebox and TimeEven have their models keeping pointers to each other, and echo their position when their view is moving.
Bug corrected : inverted Timebox when click-drag from right to left. Valur of minimum size moved to utils class.
Click+Cmd in a TimeEvent and drag, create a new Timebox (with a end TimeEvent).
Bug. Moving a Timebox is now REALLY constrained by the size of plugin Scenario.
Changes about the way to create TimeEvent from ScenarioView.

TimeEvent is now created with a signal chain (the old way is documented in doxygen).
The methods name have been changed for clarity purpose.
Signal transport now QLineF and QRectF and transport them by value (lighter and safer).
An inversion bug corrected in TimeEventView.
Command Key is now needed to create a Timebox by drawing in a Scenario. TimeEvent is created at mouse release.
Bug Timebox's name corrected.
Fix on dev branch for Linux Build
TimeEvent can be deleted. Item deletion is now working with qgraphicsitem_cast().
Observation.txt explains work in progress, problems and possible solutions.
Bug MemoryLeak corrected in PixmapButton.
Bug corrected : Timebox smallView don't exist in the first Timebox in fullView.
Doxygen comments added or moved.
ignoring .o and Makefile
remove engine
Start implementation of the plugin interface
First real take on the plug-in problem