UniqueCell Get unique rows from cell array
Description: like unique(x,’rows’), but supports cell arrays, and these
cell arrays can have columns with different types
Usage: [Y,IA,IC] = UniqueCell(X)
X: the cell array to be processed.
Y: contains the same values as in A but with no repetitions. Y will
IA: index vector IA such that C = A(IA,:).
IC: index vector IC such that A = C(IC,:).
Note that this function has only been tested on mixed cell arrays
containing character strings and numeric values.