update instructions for modifying sagenb in HACKING.rst

[ppurka]

This updates HACKING.rst. will open an issue in trac to update the documentation inside sage. This is also towards fixing #203

[ppurka]

Remaining documentation is in http://trac.sagemath.org/ticket/16911

[kcrisman]

Hi! The only truly substantive change seems to be

cd SAGE_ROOT/local/lib/python/site-packages/sagenb-*

which is of course needed. I felt like there must be more to it than this, though? Is the whole setup develop line still needed? I haven't been doing that, maybe that is a bad thing (though things still seem to work)...

[ppurka]

I think setup develop step is still needed for someone who has not installed sagenb before. It installs the dependencies for sagenb. In fact, it might still be needed if someday sagenb happens to depend on a newer version of some dependency.

[kcrisman]

You mean for someone who has not installed Sage and is trying to just install sagenb, right? I assume that the setup develop part was already done with Sage itself. The new dependencies makes sense.

[ppurka]

Hmm... can someone review this quickly? It is only documentation. I can then package this and update the sagenb package in trac. Hopefully all teh fixes since the last release will make it to sage-6.4

[kcrisman]

I don't have any problem with this except I just don't have time to set up a whole new Sage build without sagenb somehow to make sure that setup develop is necessary. But I suppose it doesn't hurt? Otherwise this is mostly cosmetic, the substantive change is correct. Certainly it's better than the current situation!