I think the previous name comes from the fact that some older versions
were distributed in tarballs named ng-spice-rework-<version>. But now
the "rework" name seems odd; most references I found on the internet
calls the package "ngspice". Fix it.
Many (less easily automatically converted) old-style strings
remain.
Where there was any possible ambiguity about the exact version or
variant intended, nothing was changed. IANAL, nor a search robot.
Use `with stdenv.lib` wherever it makes sense.
* Remove package name
* Start with upper case letter
* Remove trailing period
Also reword some descriptions and move some long descriptions to
longDescription.
I'm not touching generated packages.
