The Complete SPRLIB & ANNLIB

MARQ-variables: - some local variables used with the Levenberg-Marquardt algorithm (LOCAL)

`int`	`NumSamples`	Number of samples in the dataset containing the targets.
`int`	`NumWeights`	Number of trainable weights.
`double`	`Xgn`**	Matrix containing the gradient of the network output.
`double`	`Xtgn`**	Dito; this is the transposed of the former.
`double`	*`Ggn`**	Vector containing the gradient of the MSE.

`MARQ-variables`