Schcode flags replaced by port components

This commit contains several fixes so as to improve the overall quality
of the code. In this regard, the _calcMatchingCircuit*_ functions were
removed since they were could be easily avoided.

On the other hand, a few changes on the code structure were made in
order to concentrate all the schematic creation functionality in
_SchematicParser_ function:

1) The S2P simulation block, the ports and the different labels are now
treated as a component, avoiding the use os schcode flags which
entangled the code.

2) Because of 1), some arguments of the _SchematicParser_ function are
no longer needed (RL, XL, componentstr, wirestr, paintingstr). Moreover,
_CreateSchematic_ was removed