Strange performance bottleneck is discovered.

A bash script provided for performance testing.
The issue is in fault_tree_analysis.cc AssignIndices() function.
The containers for primary and intermediate events seem to have big
influence how the code gets compiled and run.
Many minor fixes after Coverity check.
Separation of tests for FaultTreeAnalysis from RiskAnalysis.

Required refactoring for separation is performed.
Excess header files are removed.