NF - New FrontEnd

[Adrian Pop]

This is a composite ticket to follow the development of the new frontend:

• NF core (perost, mahge930, adrpo), we keep this ticket number
• NF constant evaluation (perost)
• NF connection handling (adrpo)
• NF function evaluation (perost)
• NF local balance checking (perost)
• NF synchronous features (bthiele)
• NF operator overloading (mahge930)
• NF record handling (mahge930)
• NF unit checking (arun3688)

Tickets for each of the above will be opened.