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

[abouteiller]

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

• 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
• Dplasma corresponding request
• rename setenv_mca_param_int to something less obnoxious
• include definition of setenv_mca_param_int from public API
• 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.
• update copyrights

[bosilca]

Discussion on 10/07/22: Add support for a simple API (based on the MPI Info) and we pass this as the last argument to parsec_init. We keep the pointers to argc and argv, but we do not change them. Look at issue #431 for more info.

[therault]

the info object should be a local that is passed explicitly to the set functions, and to the parsec_init call.

the developer should have a simple way of listing the info keys.

[bosilca]

As discussed on 03/31/23 we need to merge this with #443 and get them in.