set _DEP output variables even in PKG_CONFIG case - handle not required COMPONENTS (when OPTIONAL_COMPONENTS is used)

add cmake_modules in the project - this is a copy of morse_distrib directory - for dev in Finds --> use the centralized version in trunk/morse_distrib/ of the MORSE inria forge repository and set cmake var MORSE_DISTRIB_DIR

remove cmake_modules, they are located in trunk/morse_distrib and we have to give the path to it to configure with MORSE_DISTRIB_DIR, ex: MORSE_DISTRIB_DIR=~/morse/trunk/morse_distrib - this to avoid duplication of these cmake modules between projects (chameleon, pastix, maphys, scallfmm) - for releases the directory should be copied in the root of the project, ex: ~/chameleon-1.0/cmake_modules/

in MORSE_Desc_Create_User we can use the matrix in mat field without allocating it --> avoid to free it in this case, users could need it and will manage deallocation

avoid to compare to 1 when a simple if on the variable is enough --> was causing strange behaviors in FindSTARPU.cmake for example (without MPI, STARPU_starpu_mpi.h_INCLUDE_DIRS-NOTFOUND was appending in the list of STARPU_INCLUDE_DIRS even if mpi was not required)

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

starpu_mpi_data_register is no longer a function but a macro in starpu-1.1, is replaced by starpu_mpi_data_register_comm

Avoid to add empty directories when checking a function in Finds - Fix errors in FindCHAMELEON.cmake

update the CMakeLists of chameleon to be more verbose about options set, remove set of cache for package dir (done inside Finds), remove some required non empty lists in find_package_handle_standard_args because it can be not defined in some case (without BLASEXT/LAPACKEXT)