Added the new funcions to the DEF file.
Updated VB headers from Double to Single
Changed a few APIs calls to support EN_API_FLOAT_TYPE - this needs more
work for the rest of the new functions
* VSP efficiency + retrieving efficiency directly
Changes to the getenergy function (in hydraulic.c) to compute the
correct efficiency of variable speed pumps according to the affinity
laws.
Changes to epanet2.h and epanet.c are for retrieving the efficiency of
pumps throught the ENgetlinkvalue function (code 16 for efficiency)
* Update epanet.c
* VSP efficiency (incl. bas and vb file)
- bas and vb file have been updated with code 16 for efficiency.
- Retrieving efficiency case has been improved.
