exception - comment out unused inline function in order to avoid duplicate symbols during linkage
test_add_native - remove workaround code for MSVC/mp11 issue with too many elements in tuple. This should be fixed now in develop branch
put workaround code in notepad - just in case
test_range - remove unused variables to avoid spurious warning
adjust rest of program accordingly
this should
a) factor casts out of checked operations and put them in safe_base_operations
b) simplify interval which will not explicitly check for overflows etc.
First milestone - make test_add_native pass all addition tests.
