pspp: 0.8.3: fix GUI issues

Closes #1001.
Re-adding install option for make

Last commit to homebrew-science rearranged the make arguments, but did not keep the "install" argument. This resulted in the software not being properly linked by Homebrew.
mafft 7.157
Fixing mafft test
Adding option for R shared library
Adding placeholder test
test using basic r script
Merge branch 'mafft'
Merge branch 'r'