[BBT#493] New API for parsec_init w/o cores parameter

[abouteiller]

https://bitbucket.org/icldistcomp/parsec/pull-requests/493

• [x] add info comm=%p to permit selection of comm before init
• [ ] add parsec_info_create, use parsec_info_set to pass-in arguments to parsec before parsec_init
• [x] Dplasma corresponding request
• [x] rename setenv_mca_param_int to something less obnoxious
• [x] include definition of setenv_mca_param_int from public API
• [x] decide what to do with argc, argv
  • We will keep argc/argv so that command line parameters can be 'cleaned-up' and return only argc/argv that PaRSEC didn't consume, it should be valid to pass NULL, NULL.
• [x] update copyrights