debug splitchain test case for new parser.

[jonathan-beard]

splitchain test case fails with the following error:

splitchain: 
RaftLib/src/graphtools.cpp:585: static raft::temp_map* GraphTools::duplicateBetweenVertices(raft::kernel*, raft::kernel*): Assertion `start != nullptr' failed.                                         
Aborted (core dumped)

Should be relatively quick to debug, leaving note for tomorrow.

[jonathan-beard]

In parsemap.cpp, there was a FIXME that was missed, the key is here

204                 else
205                 {
206                     /**
207                      * we need to clone the graph from the LHS (old LHS)
208                      * to the end point, then place the end kernels returned
209                      * from the clone to the RHS end of this parse graph, and put the 
210                      * source kernels in the LHS (ones in the middle aren't accessible
211                      * regardless, but adding them here will make them accessible
212                      * through the graph.
213                      */
214                     //FIXME
215                     auto *temporary_map( GraphTools::duplicateBetweenVertices( nullptr, /** temp **/
216                                                                                nullptr ) );
217 
218                     auto *cloned_kernel( destination_original->clone() );
219                     updateKernels( &kernel, cloned_kernel );
220                     parse_link_helper( &kernel, cloned_kernel );
221                     add_to_lhs_group( cloned_kernel );
222                 }

TODO: need to examine graphtools duplicateGraph routines....they're new, make issues to build test cases for both and likely graphviz script to dump the graph for visual inspection.