Corrected the release dates.
Fixed a bug in Reynolds number calculation

The flag `use_Re` calls an unknown function if it is set to `true`.  This fixes it by qualifying the function name so it can find the Modelica function.  Otherwise, Dymola falls back to assuming it is an
external C function (which doesn't exist).
Removed if-equation with q==0 from OpenHydraulics.Basic.ConstVolumeSource and replaced with Evaluate=true on definition of q (same effect)
Replaced Streams.print() statements with assert(... AssertionLevel.warning) statements
Changed type of d0 from Density to SI.Density as no type Density could be found
Changed references to T to Toperating as no component T could be found
Revert "Replaced Streams.print() statements with assert(... AssertionLevel.warning) statements"

This reverts commit f1259a7502dabf5d0a51a01275d1920d18842a8e.
Merge pull request #8 from xogeny/missingFunctionError

Fixed a bug in Reynolds number calculation
Merge pull request #7 from dietmarw/improveREADME2

Corrected the release dates.
Merge pull request #11 from harmanpa/master

Bugs in GenericOil, real-equality-with-0