* Start adding Nek5000 package
* Add tools to install: genmap, prenek, postnek
* Address comments by @davydden
* Use install_tree (thanks @junghans) and polish
* Update url
* Fix flake formatting errors
* Change F77 and CC compilers
Apparently spack compilers can't be called outside spack and we
have an underscore test in our Nek5000/core/makenek.inc file which
calls F77 compiler.
* Add support for visit and profiling options
* Fix a typo
* Fix a typo
* Remove the C check
* Add visit variant
* Update the install of int_tp tool
* Let MAXNEL to be set during installation
* removed the tags as per comment in PR# 4749
* addressed above comments
* changed fortran compiler.
* added proxy application tags.
* added tags by removing them from description.
* addressed comments
* used join_path instead of path concat.
* removed the tags as per comment in PR# 4749
* addressed above comments
* changed fortran compiler.
* added proxy application tags.
* added tags by removing them from description.
* addressed comments
* used join_path instead of path concat.
* added tags.
* changes to use MPI as depedency.
* removed MPI as variant.
* changed pointer to filtered makenek file.
* flake 8 fix.
