[Help-glpk] Hook needed in xfault()

[glpk xypron]

Hello Andrew,

if an error occurs in the GLPK library xfault is called and executes abort(). 
This is permissible in GLPSOL.

In other programs using the library this behavior causes trouble:
- The calling program cannot release objects and libraries.
- The user of a GUI program cannot save his prior work.

Please, provide a hook function in xfault() (in glib05.c).

If the hook is set, abort() should not be executed. Instead the calling program 
shall decide what to do next.

Best regards

Xypron


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