[cgma-dev] create surface skin bug

[Boyd Tidwell]

The following:

   create vertex 0 0 0
   create vertex 1 0 0
   create vertex 0 1 0
   create vertex 1 1 0
   create curve vertex 1 2
   create curve vertex 3 4
   create surface skin curve 1 2

does not work correctly.  The create surface command returns with no
message of any sort but it is obvious the command failed because no surface
is created.  Debug shows that the OCCModifyEngine::sort_curves method
called from OCCModifyEngine::make_Surface (the one which takes a curve_list
as input) returned CUBIT_FAILURE which aborts the command.  I traced
through execution of sort_curves but was not able to determine exactly what
the problem was but it obviously comes to the wrong conclusion concerning
the curves to be sorted.

Thanks muchly,

  - Boyd
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