Generating DOT file

[ppicha]

The goal is to generate a DOT file containing a node-edge graph of the AP language (individual APs as nodes connected by edges where relation exists). The extent of information included is subject to future specification.

The functionality should also provide the option to select only a subset of the APs based on individual selection, label selection, adding the related AP to the ones already selected, etc. Therefore its own section of GUI is needed.