added syntax checking for all activity diagrams, based on the algorithm used for the mainCP. So far it is not working in ADs with junctions and choices.

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completed syntax checking for diagrams in between a pair fork-join: now detecting if a path terminates on the same join node.

added syntax checkings for AD: (i) check for start state, (ii) check for disconnected sub-graphs, (iii) check for diagrams in between a pair fork-join (basic version).

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modifying the class TMLCPSequenceDiagram and TMLSDInstance so as to better fill the data structure. Part 1

modifying the class TMLCPSequenceDiagram and TMLSDInstance so as to better fill the data structure. Part 2