Fixes #301 and some other issues #354
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* in pygam.GAM._modelmat added selection of features, edge_knots and dtypes by term so only the necessary features are checked and features for factor terms can be set to 0 or 1 if another term is being checked * in pygam.GAM._flatten_mesh added two lines that set by feature to 1 if not None. This fixes issue of partial dependence of tensor terms being 0 everywhere if by feature is present * in pygam.GAM.partial_dependence removed check_X as right after it is checked in self._modelmat * updated docstring of pygam.GAM._linear_predictor * removed line that does nothing in terms.SplineTerm.build_column
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This should fix the problem in #301 and some others that #302 might not, e.g. I believe it might break due to factor feature being set to 1.0 if it is a by feature in another term. Along the way found that by feature in tensor term is not set to 1 anywhere so partial dependence returns all 0. As _meshgrid seems to be written specifically for partial_dependence and generate_X_grid made it set by feature to 1 if not None.