8.2.5.4} Geometry directives: usage notes

 $Start_expansion takes precedence over $Start_translat, which in turn
 takes precedence over $Start_transform.
 Directives $Start_expansion and $Start_translat are applied when reading
 the geometry: therefore they imply no CPU penalty. Directive
 $Start_transform, instead, is applied at run-time and requires some
 additional CPU time.

 Directives can be nested. All the directives can be used in association
 with lattices.

 The "ROT-DEFIni" cards are used by the geometry directive to transform the
 coordinates of the bodies (not of the particles!).
 If a "-" sign is placed in front of the [ROT-DEFIni name or number] of the
 "$Start_transform" directive  the inverse transformation is used instead

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