ELPA_2021.11.002_release

• fix an error when choosing the Nvidia GPU kernel (fallback to CPU might have
  been selected)
• support of Nvidia cusolver library to accelerate some routines (needs CUDA >= 11.4)
• experimental Nvidia GPU versions for "elpa_invert_trm" and "elpa_cholesky"
  can be tested by setting elpa_set("gpu_invert_trm",1) and
  elpa_set("gpu_cholesky",1). Is not used otherwise
• BUGFIX: error in resort_ev (also backported to 2021.05.002 and 2020.11.001)
• allow to call ELPA eigenvectors and eigenvalues also with GPU device
  pointers for the input matrix, the vectors of eigenvalues and the output
  matrix for the eigenvectors
• BUGFIX: error in resort_ev
• EXPERIMENTAL feature:g new real GPU kernel for Nvidia A100 (provided by Nvidia): can show a
  performance boost if number of vectors per MPI task is > 20000. Most likely
  most benifit in non-MPI version
• as anounced, droping the legacy interface
• more autotuning features, for example using non blocking MPI collectives
• new version of autotunig avoiding a combinatorial grow of possibilities
  (the old autotune version can be still used if
  elpa%autotune_set_api_version(API_VERSION, error) is set to API_VERSION <
  20211125)