created dev - branch for FMI2.0 RC2 update
swapped headers for renamed RC2 versions
update of capi source, replaced types and function definitions with RC2 nameing.
replaced type definitions with RC2 nameing.
update of example fmu2 source, replaced types and function definitions with RC2 definitions.
added missing cases "calculated parameter" and "independent" for causality switch
added missing entries "calculated parameter" and "independent" for causality
replaced errormessage for double model identifiers by info message, now legal by standard.
updated date and version number
merge DEV branch for FMI2.0 RC2 update back to trunk
Merged revision(s)  from FMILibrary/branches/dev-update-FMI20RC2:
Merged revision(s) 6291-6320 from FMILibrary/branches/dev-update-FMI20RC2 back to trunk.
new FMI standard headers, got omitted by merge.