updated dmtcp major versions

[bbarker]

The default dmtcp should really be updated to a more recent version, as it is now a major version behind (and more). I'm a nix newbie, but I needed to use this soon so it seemed like a good chance to test out nix-build. So there are a few possible issues:

• My new --replace commands may or may not be working correctly. Without these, a python expression trying to access $USER (e.g. os.environ['USER']) fails; it seems like USER is not being set correctly in the build environment. I attempted to hardcode it to the first build user for now (I guess this would work if it is possible to disable parallel builds). However, I have not checked that this works correctly because specifying nix-build -A -K dmtcp does not seem to leave the directory around, even though it now fails much later in the check phase.
• Five out of forty checks will still fail if doCheck = true. I haven't investigated these yet, but dmtcp seems to work well enough in general. I will try to investigate these more. Part of the problem could be I'm running in virtualbox for the moment.

[bbarker]

I just saw #183, which may be considered when updating this package.

[peti]

If the build needs $USER to be defined, then you can do that in the preConfigure hook, i.e. by adding the attribute

preConfigure = "export USER=nobody";

to the expression. Generally speaking, builds should not depend on the name of the user that's running them, IMHO, and I have time imagining what valid use case that script could have for such a check. It might be worthwhile to bring this topic up to the authors.

[vcunat]

I believe you tested that the package works. I pushed a squash of this with some fixes of mine (and tested it builds).