Shell scripts to set module files to be the ones provided for a site

[cjlegg]

Put this/these at $spack/../modules
Make a modulefile section for each subdir of $spack/../modules

new spacksites command: spacksites create-modulefile-scripts - makes the scripts not executes them

will loop though names of subdirs of $spack/../modules and do a module use -a

should have an inverse script of module unuse

Actually maybe a common script at root of sites / scripts - will select using arg of

[cjlegg]

commit 8af869c has bash functions to set MODULEFILES, using the conventions of spacksites - not tested because do not have many module files generated yet

[cjlegg]

issue #32 is related to this one