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