Dev chunkerkerneval

[mrachh]

1. adding functionality of using chunkers as target objects in chunkerkerneval, chunkerkernevalmat, chunkerinterior, and kernbyindexr
2. fixing chunkgraph constructor warnings in tests
3. small fix of abs \to sqrt(z^2) in quadnative.buildmat
4. add option for Neumann data of combined field representation
5. small documentation fixes

[askhamwhat]

Hi Manas,
Looks good. I was a bit paranoid so I tried calling FLAM and it broke. Think I've fixed that (it wasn't detecting when the targobj was a targinfo-like struct).
Travis