MAX_LENGTH too small

glpk uses a fixed-sized buffer when parsing mathprog input; and the buffer size is a tiny 100 bytes. This can cause problems when reading or writing files with long paths; and especially when using SQL input.

Suggest changing this to something much larger but still reasonable, at least 8,000 bytes and preferably more.

Some discussion on the mathprog mailing list: https://lists.gnu.org/archive/html/help-glpk/2009-03/msg00036.html

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: glpk-utils 4.65-1
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Jan 14 20:44:21 2019
InstallationDate: Installed on 2018-03-23 (296 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180306.1)
SourcePackage: glpk
UpgradeStatus: No upgrade log present (probably fresh install)