Merge pull request #687 in G/fastr from ~FLORIAN.ANGERER_ORACLE.COM/fastr:maintenance/frameparam to master

* commit '8d9f07e9':
  Adapted to changes in GR-1767: frame parameter removed from interop functions and transitively from all callers where possible. Also updated Truffle version in file "suite.py". Removed class TruffleRFFIFrameHelper since there are no usages any longer. Removed unnecessary call to CompilerDirectives.transferToInterpreter call in class ValuePrinterNode.