isettools and isettools/data

[DavidBrainard]

I think that the isettools directory should be renamed 'code' and that 'isettools/data' should come out of 'isettools' and live on its own at the top level.

Then we will have code, data, scripts, tutorials, and validation/scripts all of which can contain parallel subdirectory structure. How cool is that.

This proposed change requires fixing up some functions that define where stuff lives in the isetbio directory. Brian indicated he is the one who can make these changes most efficiently, so we'll leave this in his lap for a rainy day activity.

[DavidBrainard]

There are also data in places under scripts color (e.g. cMatch) and scripts/optics (e.g. chromAb) that might be converted into isetbio format and moved into the data dir. Or made to go away, if they are obsolete. It would be nice to have all of the isetbio data files collected in one place.