rsort -- sort a list or matrix in reverse order

Description

Same as sort except that the elements or columns are placed in reverse order.
 i1 : rsort {4,2,3,1} o1 = {4, 3, 2, 1} o1 : List
The optional parameters are the same as for sort.
 i2 : R = QQ[a..d]; i3 : m = matrix{{a*b, c*d, a*d^3, b^3*c, 1_R}} o3 = | ab cd ad3 b3c 1 | 1 5 o3 : Matrix R <--- R i4 : rsort(m, DegreeOrder=>Ascending) o4 = | b3c ad3 ab cd 1 | 1 5 o4 : Matrix R <--- R