Added ENgetheadcurve(), ENgetpumptype() and related constants.
Fix ENgetlinkvalue() for EN_MINORLOSS and pumps.
Merge pull request #11 from sdteffen/pumptype

Added ENgetheadcurve(), ENgetpumptype() and related constants.
Merge pull request #12 from sdteffen/pumpEN_MINORLOSS

Fix ENgetlinkvalue() for EN_MINORLOSS and pumps.
ENgetlinkvalue(EN_LINKPATTERN) allows to retrieve pump patterns.
Simpler, faster code using PUMPINDEX()
Merge pull request #13 from sdteffen/pumpEN_LINKPATTERN

ENgetlinkvalue(EN_LINKPATTERN) allows to retrieve pump patterns.
Merge pull request #14 from sdteffen/usePUMPINDEX

Simpler, faster code using PUMPINDEX()