context: Add a function to return the chameleon context in order to be able to use the public runtime API

zgetrf batched: Add an a field in the data structure and environment variable to define the batch size

compute/map: Improve the map function to take into account multiple descriptor and multiple implementations for the kernel to apply.

descriptor: Fix a major issue with global allocation in distributed and update comments in the structure for better understanding

header: Move the environment variable management function to the main include dir to allow their use in the testings

EYRAUD-DUBOIS Lionel authored 2 years ago and Mathieu Faverge committed 1 year ago

descriptors: Add an arg parameter to the rank_of functions to enable the use of more complex solutions.

control: store the ncuda field in the options to know at insertion time if cuda kernels are enabled or not

getrf: add an alg parameter to dynamically switch from one algorithm to another through environment variable

hip: replace deprecated hipMallocHost by hipHostMalloc

control: Restore MPI_THREAD_MULTIPLE removed by !282 as SERIALIZED seems to be insufficient to manage the datatypes