added code to deal with different frame_types
Merge pull request #195 from crisien/nit

added code to deal with different frame_types
Adds Partial Pressure of CO2 in Air or Surface Seawater
Updates README
Merge pull request #196 from cwingard/pco2

CIDEVMI-1091 Adds Partial Pressure of CO2 in Air or Surface Seawater
Adds wrapper functions for VELPT instruments
Merge pull request #197 from s-pearce/velpt

Adds wrapper functions for VELPT instruments
METBK: new rainheatflux calc, added TIMEFLX-AUX product.
Merge pull request #198 from desiderr/metbk2

CIDEVMI-1043: METBK: new rainheatflux calc, added TIMEFLX-AUX product.
fixed some comments for vel3d-k
updated the vel3d-k algorithms to require an Nx5 beam configuration array instead of an Nx4 array as coordinated with Paul Savickas.  The 5th beam however is unused and is dropped
Merge pull request #199 from s-pearce/vel3d

updated the vel3d-k algorithms to require an Nx5 beam configuration array instead of an Nx4 array as coordinated with Paul Savickas.  The 5th beam however is unused and is dropped
FDCHP: DPAs and unit tests.
Merge pull request #200 from desiderr/fdc

FDCHP: DPAs and unit tests.