Export logical model - extend "Use Generic Reaction Names" for reactions

[kolczyk]

In the export dialog for logical models an option "Use Generic Reaction Names" is provided. If a label (:LABEL) is provided for the gates and the box is not checked, the String specified as label is used as reaction name for CNA. This label is only present if the model has been imported from cna format previously. If no label is specified, the status of check-box has no influence on the exported model (The reaction name is composed from the names of connected compounds and describes the equation, e.g. a+b=c). If no label is specified and the box is not checked the module-name of the gate should be taken. This name would be preserved throughout the working cycle (export log model - changing the model in CNA - import the model into ProMoT) and enables the reuse of a graphml file of the original model.