ropp_pp_occ_tool; numerical differences with ifort16

[cburrows]

Using GRAS phase/amplitude test data, the test folder test IT-PP-03 gives large numerical differences relative to ifort12. This has been tracked down to the matrix inversion function:

ropp_pp_occ_tool -> ropp_pp_bending_angle_go -> ropp_pp_regression -> ropp_pp_regression -> ropp_pp_quasi_invert -> ropp_pp_invert_matrix

The updates of array 'A' in this function show numerical differences in WRITE statements. This is a starting point for further investigations.

This may be an optimisation issue (-O2 is used here).

[cburrows]

Zip of ropp_pp directory containing WRITE statements used for diagnosis. Test data and truncated output files are in the 'tools' directory. Many files/dirs (e.g. 'tests', 'data') have been removed to reduce size of tarball.