Singular Manual: bigintmat operations

| ### 4.3.4 bigintmat operations `+` addition with intmat, int, or bigint. In case of (big-)int, it is added to every entry of the matrix. `-` negation or subtraction with intmat, int, or bigint. In case of (big-)int, it is subtracted from every entry of the matrix. `*` multiplication with intmat, int, or bigint; In case of (big-)int, every entry of the matrix is multiplied by the (big-)int `<>`, `==` comparators bigintmat_expression `[` int`,` int `]` is a bigintmat entry, where the first index indicates the row and the second the column Example:
      bigintmat m[3][4] = 3,3,6,3,5,2,2,7,0,0,45,3;
      m;
    ==> 3,3, 6,3,
    ==> 5,2, 2,7,
    ==> 0,0,45,3
      m[1,3];               // show entry at [row 1, col 3]
    ==> 6
      m[1,3] = 10;          // set entry at [row 1, col 3] to 10
      m;
    ==> 3,3,10,3,
    ==> 5,2, 2,7,
    ==> 0,0,45,3
      size(m);         // number of entries
    ==> 12
      bigintmat n[2][3] = 2,6,0,4,0,5;
      n * m;
    ==> 36,18, 32,48,
    ==> 12,12,265,27
      typeof(_);
    ==> bigintmat
      -m;
    ==> -3,-3,-10,-3,
    ==> -5,-2, -2,-7,
    ==>  0, 0,-45,-3
      bigintmat o;
      o=n-10;
      o;
    ==> -8,  0,0,
    ==>  0,-10,0
      m*2;           // double each entry of m
    ==>  6,6,20, 6,
    ==> 10,4, 4,14,
    ==>  0,0,90, 6
      o-2*m;
    ==>    ? bigintmat/cmatrix not compatible
    ==>    ? error occurred in or before ./examples/bigintmat_operations.sing lin\
       e 15: `  o-2*m;`

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