Latest C/C++ compilers (MacOS 10.10, GCC on RHEL7 and Ubuntu) generate a large number of new
warnings about unused variables, unused functions, dead code, failure to check return values of system
Some of these warnings catch real bugs so we do not want to turn them off.
Most of these warnings have been cleaned out in the latest MIDAS code. On MacOS and RHEL6 Linux MIDA
S compiles without any warnings. On RHEL7 and Ubuntu Linux there are some warnings from a few
problematic files, history.c being the worst (it will be eventually cleaned out).