Denote non-resonant last steps in schemes

[Reinhard-Heinke]

In some cases and for people new to the field, it might not directly be clear if a last step goes into an auto-ionizing state, or is a brute-force high photon density laser (typically 532nm Nd:YAG SHG). E.g., https://rims-code.github.io/schemes/hg/hg-002/, but also a lot more schemes employ this. It might make it easier to somehow specifically denote this last step as non-resonant, and specifically not draw a line at its end, implying an actual state.

[trappitsch]

Yes, very good point. This should in this case be:

• Added to the input mask (defaults to "is ionizing transition"?)
• Added as a field in the database
• Automatically be added to the site if the field exists

Will be a bit of work to go through the schemes and add this, but I think for most (all?) of the schemes, we should have the knowledge to figure this out for the existing schemes.

What do you think: I can prepare a list of all schemes that exist for us to go through, and then we get together and hammer the specifications out in 30ish min?