New subscores, Lua functions needed

[Timo van der Laan]

At least one new function is needed to keep my DRW recipe working efficient:
puzzle.GetSubscorenames() giving the names of the subscores that are active in that puzzle.
And maybe just a function to deliver all possible subscores for instance using help("subscorenames").
For now I really need a list of possibles in the LUA functions with information which ones are optional (depending on puzzle type) and which ones are always there.

[Bruno Kestemont]

I need it too. otherwise, there are infinite loops when a subscore doesn't exist