move Simmetrix core libraries to end of link line
move Simmetrix core libraries to end of link line

so far we've gotten more or less lucky.
the model interfaces and advanced libraries
should show up first on the link line now.
also better variables for what sets of
libraries are being dealt with.

yangf4/core,yangf4/core,yangf4/core,yangf4/core,yangf4/core