Option: Change simulate to do the integration over model numbers in the bql function rather than the metamodel

[axch]

Benefits:

• Easy to generalize to accepting a range of model numbers
• Simplifies metamodels a little

The usual reason to push things into the metamodel doesn't seem to apply, because I can't imagine anything smarter the metamodel could do than what the bql function would do.

[gregory-marton]

Or a set of model numbers, perhaps identified by some sort of tag. See #313 .

[axch]

Yes. Tag-based identification is orthogonal.

[fsaad]

Should be the case for most functions in bqlfn.py except:

• dependence probability.
• row similarity