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[lib] MCLA/CLU: Save some cycles when there is no more solution for a given step; Auto-adjust max_step until max_user_step is reached

[lib] Remove attrs hloc/wloc in CStartNode, CSimpleNode, CInputNode; Relative to refactor of XmlVisitor

the sub-nodes were attached to the general MacroNode not to the current MacroNode

- Test preamble presence
- Transitions are written in unpredictable order => use a set
- Add doc

Note: check only for xml models