Submodules

[bakerb845]

Need to add submodules for ISCL to the git repo and integrate with CMake for one-stop-shopping.

That way CMake does something intelligent like:
if (NOT ISCL_LIB)
git pull libiscl
set config
cd libiscl
cmake
make
cd ../
endif

-> I'm not sure if the EEW SVN will prove to be as clever as git.