2.3.8} Assigning materials to regions

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 A material must be associated to each of the geometry regions, except to
 those defined as blackhole. This is done in a very straightforward way by
 command ASSIGNMAt. Assigning explicitly blackhole to a region is allowed, but
 is not necessary (except for region 2) because a region is blackhole by
 default unless another material has been associated to it. Region 2, if no
 material is assigned, is COPPER by default). The table entitled "Regions:
 materials and fields", in the standard output, can be consulted to check that
 material assignment has been done as desired.

 For the present example the assignment could be:
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
 *  Be target, 1st and 2nd half
 ASSIGNMAT        5.0       3.0       4.0
 *  External Black Hole
 ASSIGNMAT        1.0       1.0
 *  Vacuum
 ASSIGNMAT        2.0       2.0

 The same material assignments in a name-based input would be the following
 (BLCKHOLE and VACUUM are the predefined names of material 1 and 2):
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
 *  Be target, 1st and 2nd half
 ASSIGNMAT   BERYLLIU   UpstrBe  DwnstrBe
 *  External Black Hole
 ASSIGNMAT   BLCKHOLE  Blckhole
 *  Vacuum
 ASSIGNMAT     VACUUM  Vacarund

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