A pointer to a correctly constructed
NET structure.
RETURNS
TRUE if an error occurred, FALSE if not.
FUNCTION
This function supposes that the network structure is already known, and reads
only the weights and biases (i.e. the variable parts) of the network.
The net parameter has to point to a network structure matching the number
of weights and biases in the file. No checking is done.
NOTE
This function was created because for large networks the size of the network
save file may become excessively large. If the network's structure is fixed,
there is no need to store it.
Note that no history values (see HIST-flags) are stored.
