next IBPSA integration

[thorade]

merge IBPSA up to commit 6840f6ce4729b9494930c2e1b967aa322cd4f63c https://github.com/ibpsa/modelica-ibpsa/commit/6840f6ce4729b9494930c2e1b967aa322cd4f63c

last IBPSA merge was done in PR #77 non-backward compatible changes since then: https://github.com/ibpsa/modelica-ibpsa/issues/763

https://git.io/vdFUu https://git.io/vFGqf

[thorade]

Changes in the OpenModelica testing will be visible here:

• https://libraries.openmodelica.org/branches/master/BuildingSystems/BuildingSystems.html
• https://libraries.openmodelica.org/branches/history/master/
• https://libraries.openmodelica.org/branches/history/master/2017-10-24%2018:30:50..2017-10-25%2009:25:35.html