Optimize print matrix as string

[rosaigor138]

Closes #422

[atilaajones]

The printout is better, but there is still distortion of the column in the case of negative numbers. I think this can be fixed, even if only with white space in front of positive numbers.

Another detail is that when the matrix is made up only of integers, then 5 should appear instead of 5.0000, as it was before (branch main). It may be necessary to separate the print handling for each of these cases.

Matrices with integer entries only

• Adjacency Matrix
• Laplacian
• Signless Laplacian Matrix
• Incidence Matrix
• Distance Matrix
• Seidel Matrix
• Laplacian Distance Matrix
• Signless Laplacian Distance Matrix
• Eccentricity matrix

Matrices with non-integer entries

• Normalized Laplacian Matrix
• Randic Matrix

[atilaajones]

The alignment is correct. The printing of integers and irrational numbers still needs to be improved.

[fsoupimenta]

The problem wasn't formatting the array, as the pythonnp.array2string method already performs this task efficiently.

What was happening was that PyQt was using a proportional font in each cell of the table. This means that each character has a size according to its proportion, making it impossible to compensate for the difference in size with white space, especially in the case of negative numbers, as in the example.

To solve the problem, the Courier New font was used, which is a monospaced font, i.e. all characters have a fixed size, resulting in the following alignment: