Add the possibility to enter Chameleon with an existing starpu (Need to be cleanup on the starpu_initialized function)

add MORSE_Pause/Resume function to avoid CPU consumption when no tasks have to be executed - call starpu_pause/resume, do nothing for quark (no need)

move init of starpu parameters in a single place (RUNTIME_init_scheduler) and use dmdas default scheduling strategy

change the way we include our own header files --> relative to the root - when plasma is in the same env, chameleon can take some headers not belonging to it (ex: #include descriptor.h, this file states in plasma install dir also) which make compilation errors

magma_ztsqrt_gpu is now defined in magma-1.6.0: change the name of our magma routine in magma_ztsqrt2_gpu

change copyright - correct whitespace - place cmake module depending on chameleon in cmake_modules and no more in cmake_modules/morse