mtlb_toeplitz Matlab toeplitz emulation function

## Description

Matlab and Scilab `toeplitz` behave differently in some particular cases:

- With one input parameter: if this parameter is complex or is a matrix, output value of Matlab and Scilab `toeplitz` can be different.

- With two input parameters: if they are vectors and their first elements are not equal, Scilab returns an error but Matlab gives priority to the column element. If they are matrices, output value of Matlab and Scilab `toeplitz` are different.

The function `mtlb_toeplitz(c[,r])` is used by `mfile2sci` to replace `toeplitz(c[,r])` when it was not possible to know what were the operands/inputs[CUSTOM] while porting Matlab code to Scilab. This function will determine the correct semantic at run time. If you want to have a more efficient code it is possible to replace `mtlb_toeplitz` calls:

- When called with one input, if `c` is a real scalar or vector `mtlb_toeplitz(c)` may be replaced by `toeplitz(c)`

- When called with two inputs, if `c` and `r` are scalars or vectors and their first elements are equal `mtlb_toeplitz(c,r)` may be replaced by `toeplitz(c,r)`

Caution: `mtlb_toeplitz` has not to be used for hand coded functions.