[Bug-glpk] patch: remove spurious "zero element not allowed" errors

[Steven G. Johnson]

I've just begun using GLPK (version 4.8), and I notice that you give a 
"zero element not allowed" in glplpx1.c if lpx_set_mat_row, etcetera are 
called with some zero matrix entries.

In many cases, however, it is convenient for the user not to have to check 
whether a matrix element is zero before calling GLPK, and it seems to me 
that this error is unnecessary.  In particular, inside lpx_set_mat_row 
etcetera you could simply check for zero matrix elements and skip them.

I've attached a patch to accomplish this.

Cordially,
Steven G. Johnson

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