FAST_LA _ _ _ _ _ _ _ _ _ _ _ _ switch

By turning the fast_la switch on, the speed of the following functions will be increased:

add_columns,

add_rows,

augment_columns,

column_dim,

copy_into,

make_identity,

matrix_augment,

matrix_stack,

minor,

mult_columns,

mult_rows,

pivot,

remove_columns,

remove_rows,

rows_pivot,

squarep,

stack_rows,

sub_matrix,

swap_columns,

swap_entries,

swap_rows,

symmetricp.

The increase in speed will be negligible unless you are making a significant number (i.e. thousands) of calls. When using this switch, error checking is minimized. This means that illegal input may give strange error messages. Beware.