Gaphas is not storing linkage or port meta data only state meta data

[franzlst]

All meta data of transitions, io data ports and outcomes are not stored. The modification history also do not list meta data changed actions what is a hind for the case that gaphas is not writing this information into the meta data dict.

To preserve the functionality this issue includes two sub-tasks:

• recover the functionality know in the past with proper meta signal generation for observers like the modification history
• extend the storage or gaphas tests to preserve this functionality

Added at 2017-02-24:
This issue needs a representation (test) in issue #175 to preserve gaphas functionality and as reliability to the user.

Originally created by @Rbelder at 2016-11-23 13:01:18+00:00 (moved from RMC internal repository)

[franzlst]

First sub issue should be fixed with 59cbce9

Originally created by @franzlst ([email protected]) at 2016-11-28 08:42:16+00:00 (moved from RMC internal repository)