mechanism to handle entries with Number=X where X > 1

[brentp]

For fixed numbers, e.g. Number=2, we could create two fields, so

##INFO=<ID=abc,Number=2,Type=Float,...>

we could have in the database

abc_1 FLOAT
abc_2 FLOAT

or we could have an additional table with a many-to-1, that would give an additional table to join to for every column that had Number != 1.

I think the best option is to default to database type = VARCHAR for stuff with Number > 1 but allow a --force-split option or something similar so the user can specify arguments that they want to be split into sepearate columns as for abc above.

--force-split abc --force-split dp4

etc.