This is CFFEPS code used in ECCC MSC RAQDPS system.
This commit updates original code in C to FORTRAN ported verison.

Internal revision tracking this is cloned from arqi/cffeps repository
(tag CFFEPSv4.1) revision -- extracted and modified for github release.
*/cffeps/commit/98265cb5f27f6696e6fa44af6073e95601f7ada9*