by GiftiSurface. Adding comments to confusing model fit code to try
and make refreshing our memories easier.

kept in these classes, instead of in FSLeyes.

of (M*3,). New gifti module for basic gifti surface support.

identifying reference image associated with a FIRST vtk file.

log.memory .. all the __init__ stuff will make its way over to FSLeyes.

from a label file. Other minor typo fixes.

GC'd before class instances - calls to log inside __del__ were bombing
out.

be > high bounds, causing rendering/bounds calculation problems. Other
minor fixes.

level.

because the DC.bounds property cannot be unbound.

non-volumetric data. Need to test, and need to update render.py

support more data types, I can look at organising a class/name
hierarchy but, until then, Model will be fine. Bugfix to overlayselect
panel (name property callback now being passed Display instead of Image).

are now required to have a 'name' attribute and a 'dataSource' attribute.