[Scitech] Octave 5.1 progress

[Orion Poplawski]

I've been working on Octave 5.1 builds for Rawhide and EPEL-7 here:

https://copr.fedorainfracloud.org/coprs/g/scitech/octave5.1/

Build status notes:
https://docs.google.com/spreadsheets/d/1a-cjNm1AB2ZWpAdGwE0zp_vmiyJeKGGkB3Bn...

I'm pretty close to updating octave in rawhide proper, but want to see 
if a couple issues are fixed first.

Testing is appreciated.  I'll also be building an octave 5.1 module as 
well once I've updated octave in rawhide.