Add ut_array functions.

Added functions:
  - ut_array_1d_int_add  : add two int arrays.
  - ut_array_3d_int_1d   : create a 1D int array from a 3D int array.
  - ut_array_1d_int_set_3: set the values of a 1D int array of length 3.
Merge branch 'ut_array'

Fixed ut_array_2d_fprintf_col.