Support deep module alias with module name not related to an existing directory

[xdelaruelle]

mkdir -p test/{bar,foo}
for i in test/bar/.modulerc test/bar/1 test/foo/1; do
echo '#%Module' >$i
done
echo 'module-alias bar/sub/2 foo/1' >>test/bar/.modulerc

module use ./test
module load bar/sub
ERROR: Unable to locate a modulefile for 'bar/sub'

Module alias is not found if sub parts of its name contains reference to a non-existent sub-directory, here sub in this example.

mkdir test/bar/sub
module load bar/sub
module list
Currently Loaded Modulefiles:
 1) foo/1

To implement this, some code should be added to GetModules procedure to create virtual directories based on alias names if there is no actual directory matching.