changed variable names
Make gcc minimum sometjhing older
Fix for non-existent compiler executable
Modify make system to accommodate non-ifort fortran compiler. All the flags previously defined were specific to ifort. I also added a script that determines which C and Fortran compilers are installed, and then sets those in the make system. You can override the compilers with environment variables - CUSTOM_COMPILER and CUSTOM_FCOMPILER.; Also fix broken gcc build in proj/lev0
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