make_modeling_object: Make modeling object
In myoung3/regionalkrig:

Make modeling object. Executes PLS regression.

1	make_modeling_object(rawdata, exclude.vars, UK.varnames, pls.comps = 5)

`rawdata`	See rawdata under PLSK.full
`exclude.vars`	String vector listing variables to exclude from PLS
`UK.varnames`	Sting vector listing variables that will be included for universal kriging and therefore should not enter into PLS.
`pls.comps`	Integer indicating the number of PLS components. Default is 5.

A list named PLS The PLS object is a list of 19. In general below, m is the number of monitors.

coefficients: List of 3-dimensional matrix (number of... monitors plus 32?, y, and 5 components?)
scores: Matrix that is... monitors by 5 components
loadings: Matrix that is number of monitors plus 32 by 5
loading.weights: a similar matrix?
Yscores: Matrix that is number of m x 5
Yloadings: Matrix 1 x 5 that?
projection: 366 by 5 matrix
Xmeans: numeric vector
Ymeans: Number indicating?
fitted.values: 334 by 5 matrix
residuals: 34x1x5 matrix
Xvar: Vector of 5 named numbers
Xtotvar: Number indicating?
fit.time: Named number indicating?
ncomp: Integer.... 5
method: "kernelpls"
call: language plsr(formula = y ~ covars.pls, ncomp = pls.comps, data = model.obj, validation = "none")
terms: Classes 'terms', 'formula' length 3 y ~ covars.pls
model: data frame of y and covars.pls, which is 334 by 366?