Log Message:
glpk: updated to 5.0

GLPK 5.0

The copyright was transferred to the Free Software Foundation.

To fix some licensing problems the routines in the following
files were disabled by replacing with dummy ones that print an
error message:

src/api/gridgen.c
src/api/netgen.c
src/api/rmfgen.c
src/misc/qmd.c
src/misc/relax4.c

Note that this change does not affect the main faunctionality
of the package.

Some minor bugs were fixed.