Remove useless code (copy-pasted and unreachable).
Update Reader: add the python interface, remove the old one.
Update GripperControl: add the python interface, remove the old one.
Reintroduce WeightAdder.
Correct the path to the plugin directory of dynamic-graph.
Merge branch 'master' of github.com:jrl-umi3218/sot-core into topic/eigen

Conflicts:
	include/sot/core/gripper-control.hh
	include/sot/core/reader.hh
	src/matrix/operator.cpp
Merge branch 'topic/eigen' of github.com:elie-moussy/sot-core into topic/eigen