cmake: add link dir for KDL to python bindings to make it buildable without ROS

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
cmake: make sure PyKDL gets intalled in the right directory, not super robust though

Signed-off-by: Ruben Smits <ruben.smits@intermodalics.eu>
Merge branch 'master' of http://git.mech.kuleuven.be/robotics/orocos_kinematics_dynamics
added simple specialized implemenation to clarify possible interfaces. Next is to separate out template arguments and start doing it properly
added first templates on iterate meta function. Need to think about how to further parametrize
almost finished impl for single node iteration without templates. Next is to analyze the result and start doing for a tree
added operations to iterate over tree
added template based composer and modified sources based on the composition rules defined in the report
added template version of transform and traits for each type of transform, but need to fix parameter passing. Currently only pass by value, thus does nothing
need to check parameter passing and argument deduction
Fixed operator <<(std::ostream& os, const Tree& tree)
corrected inheritance based version and started with template based iterations
corrected inheritance based version and started with template based iterations
added partial specialization of operationtraits
need to check the temporaries that are created
minor changes to traversal design
Merge branch 'master' of http://git.mech.kuleuven.be/robotics/orocos_kinematics_dynamics
traversal class and policies
added operation_traits which reverses the process when compored to the previos OperationTraits, which hard coded the number of params. Now it can be extended. Have to continue with Policy classes and check Featherstone book for possible decomposition of computations
implemented basic policy classes, iterateOver works with non-composites, have to complete composite types