Corrects ph_calc_phwater for multiple calibration records
Merge pull request #83 from cwingard/phsen

CISWMI-212 Corrects ph_calc_phwater for multiple calibration records
CTD functions for CTDMO and CTDPF
Commented out writes to stderr; used numpy testing routines
Merge pull request #85 from desiderr/ctdwork

CIDEVMI-1001 CTD functions for CTDMO and CTDPF