XML input file for TwoTrain fault tree.
XML input files for ABC and AB_BC fault trees.
Add fault tree pointer in fault tree analysis.
Node to event change and Basic/House event separate classes.
New input xml files.
Deprecate Transfer symbols as gates behavior.

This is done because the new XML input format has a include directive
with a different behavior. The transfer symbols will be used to
indicate re-used gates in future.