added option to avoid events in heat pump model. This increases the thermal mass significantly to avoid getting out of temeprature bounds.
Added option for computing the heat exchanger pressure drop outside of the HeatPump model
Merge branch 'Annex60' into issue_heatpump
added better description of riseTime parameter in heatPump
added example demonstrating avoidEvents parameter in HeatPumps
added documentation for heat pump models and examples
clarified description of mFactor in heat pump and added correct tab for this parameter
Merge branch 'Annex60' of https://github.com/open-ideas/IDEAS into Annex60
Merge branch 'issue149_avoidEvents' of https://github.com/open-ideas/IDEAS into Annex60
add min value for mBrine and mWater to avoid division by zero, update Water to Water.Simple and rearrange graphical interface HeatPumpTset.mo
Merge branch 'Annex60' into issue149_avoidEvents
Merge branch 'Annex60' into issue149_avoidEvents
Merge pull request #155 from open-ideas/issue149_avoidEvents

avoiding events to be generated in heat pumps