Deleted obsolete pseudo-package IDEAS/Media/Air.mo
Two simple hysteris controllers with variable uLow and uHigh and release for heating and cooling
Example and unittest for heatpump air-water (#47)
Heatpump AW now allows events, but this does NOT slow the model down, specifically not with LSODAR (#47)
Merge branch 'issue47_AllowMoreEvents' of https://github.com/saroele/IDEAS into Annex60

Conflicts:
	IDEAS/Media/Air.mo
replace the Hyst_Var_Cooling.mo and _Heating by a general hysteresis valid for both cases and with conditional inputs.
add unit test for HysteresisRelease_Cooling.mos and _Heating
Deleting obsolete and double defined Air.mo (replaced by package Air).  Not clear why I have to do this again, commited this before.
Different changes in the documentation, and ensuring that the new release control is used in the heat pump and boiler's heatsource models.
Revert "Deleting obsolete and double defined Air.mo (replaced by package Air).  Not clear why I have to do this again, commited this before."

This reverts commit a3f2f82d8a15df9c2441a6f15d543c918413fb8d.