Renaming

This MR is supposed to fix issue #47 by applying the suggestion of renaming discussed and a little more.
Here is a summary of the filename changes:

In include directory:
  * `morse.h` => `chameleon.h`
  * `chameleon/chameleon_config.h.in` stays as it is
  * `chameleon/morse_zc.h` => `chameleon/chameleon_zc.h` with all mixed-precision routines
  * `chameleon/morse_z.h`  => `chameleon/chameleon_z.h` with all single precision routines
  * `chameleon/morse_constants.h` => `chameleon/chameleon_constants.h` for all Chameleon constants
  * `chameleon/morse_fortran.h` => `chameleon/chameleon_fortran.h` for wrappers of `CHAMELEON_...` routines only
  * `chameleon/morse_simulate.h` => `chameleon/chameleon_simulate.h` might be integrated in `chameleon.h`
  * `chameleon/morse_struct.h` => `chameleon/chameleon_struct.h` for CHAMELEON structures (descriptors, context)
  * `chameleon/morse_types.h` => `chameleon/chameleon_types.h`
  * `chameleon/morse_runtime.h` => `runtime.h`
  * `chameleon/morse_struct.h` => `runtime/runtime_struct.h` for RUNTIME structures (context, sequence, options)
  * `chameleon/morse_kernels.h` => Integrated into chameleon_tasks.h
  * `chameleon/morse_tasks.h`  => `chameleon/chameleon_tasks.h`
  * `chameleon/morse_tasks_z.h` => `chameleon/chameleon_tasks_z.h`
  * `chameleon/morse_tasks_zc.h` => `chameleon/chameleon_tasks_zc.h`

Regarding the functions and structures:
  * Everything related to the RUNTIME API (except the tasks) becomes RUNTIME_ something
     * This includes RUNTIME_sequence_t, RUNTIME_request_t and RUNTIME_option_t that were called MORSE_xxxx
     * MORSE_TASK_xxx becomes InsertTask_xxxx to remove the MORSE keyword, and not put the RUNTIME one, but any other suggestion is more than welcome
  * All MORSE_ functions become CHAMELEON_
  * The same for all structure related to Chameleon, except morse_desc_t that become matrix_desc_t in an attempt to be generic.

All, and especially those involved in #47 discussions (@sylvand, @ltaief, @agullo, @fpruvost, @thibault, @furmento) please have a look and comment directly in the code on the web interface to start discussions where it's needed.
I would like to close this issue as soon as possible, so we can definitely move towards the 1.0.0. Thanks.

See merge request solverstack/chameleon!90