Create STAP-DP data structure

stapDPspec(stapless_formula, fake_formula, stap_mat, K, benvo)

Arguments

stapless_formula	from `get_stapDPspec`
fake_formula	list of ``fake'' formulas from `get_stapDPspec`
stap_mat	matrix of stap specification properties
K	DP truncation
benvo	Built Environment object - `Benvo` - containing data for model