Merge branch 'issue61_dymola2015' into issue65_synchBuildings
Added additional Type declaration.

These are needed for heat exchangers in Buildings library.
Improved documentation.
Removed unrequired assignment of species concentration.
Added pressure drop.

This is needed for te model to also work with incompressible media, such as used in the Buildings library.
Merge branch 'master' into issue65_synchBuildings
Removed import statements.
Removed import statements.
Added tolerance 1e-6 to simulation command.
Merge pull request #66 from iea-annex60/issue65_synchBuildings

Issue65 synch buildings