Create named virtual IED

[JakobVogelsang]

At the moment the menu plugin creates an IED with the name SPECIFIED. This is by design not linked to any of the LNode elements that it is generated from. There are cases where a user need to create a "named" virtual IED and is then expecting that the LNode elements it is generated from are linked to the IED at the same time.

Example
LNode before : <LNode iedName="None" lnClass="PTOC" lnInst="1" lnType="..." />
LNode after now is not changed at all
expected behaviour when IED.name = NewIED is not SPECIFIED <LNode iedName="NewIED" ldInst="..." lnClass="PTOC" lnInst="1" lnType="..." />