add the borefield model from the branch Florian from damienpicard/IDEAS
rename package boreholes to GroundHeatExchanger
minor changes
remove the Modelica Buildings Library references (to be continued).
change GroundHeatExchanger to GroundHeatExchangers
adapt Scripts/ShortTimeResponseHX.mo and add .mat file to ShortTermResponse for example and example_accurate.
remove obsolete models and finish compatibility with new IDEAS
package order
adapt the HeatPumpOnOff.mo model to make it scalable.
add Examples/MultipleBoreholesWithHeatPump.mo + minor changes.
add erf.c to C-Sources, change relative path of function and delete obsolete examples.
adding example and cleaning code
working example with heating system, heat pump and borefield.
add the specification of borefield and change double back-slash to single back slashes.
Merge branch 'Annex60' of https://github.com/open-ideas/IDEAS into issue54_addBorefieldModel
change the relative path of the .mat file to absolute path using Utilities.files.LoadResource
remove the input Q_flow of the borefield.
change place of annotation
removed absolute pressure from GroundHeatExchanger model
added mixing volume and fluidflowresistance to GroundHeatExchanger model for simulating pressure drop and temperature change
extended partials for passing and declaring parameters
changed icon
updated examples for these changes
correct the direction of the two port, edit the examples accordingly and handle the fixme of mathadon.