Update ArpackSym.java to support the generalized eigenvector problem.

[shilad]

Right now MTJ's ArpackSym.java supports A*x = lambda*x.

I'm looking for a fast sparse solver for A*x = lambda*M*x. It looks like dsaupd supports the generalized eigenvector problem, but ArpackSym.java doesn't yet implement it.

Thanks for the excellent library!

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[fommil]

I'd accept a pull request in that area with good tests.

[shilad]

Thanks. I'm attempting to work around it. If I can't, I'll create a PR for it.

[fommil]

that'd be great. Do you know ARPACK and the examples that it comes with? I basically translated the simple symmetric solver into java to get ArpackSym.

[fommil]

(it's probably easer to do than you think... netlib-java should support all the ARPACK routines that you need)