Merge branch 'master' into XMLmaterialIO
units can now be flagged for XML export
xml export now supports conversion to units known by ANSYS
fix in property definition
added parameter for 'Material Property'
removed unused class ParameterSet
changed interface of property constructor and property clone method
added reference temperature as stand-alone property
now uses dedicated reference temperature property class
fix in xml export of unitless unit + fix in xmlexport flag behaviour
moved 'Material Property' parameter to the end of the list of parameters
fixed xml io for secant CTE properties
Merge branch 'XMLmaterialIO'