comment and unit test cleanups
move some helper functions to "private" directory
new function to compute bandwidth with Ruuth--Merriman formula
more helper functions to private
more files to private
stencil based refinement added

other refinement codes moved around a bit
still a bit of work-in-progress
add .pickle to gitignore
more work on refinement
Octave fixes: mostly path treatment and named tic/tocs
bug fix: interp3_matrix invbandmap fix typo
more unit tests
Octave fixes, unit tests now pass (except 1)

also some fixes from mlint, and comment out non-deterministic tests (timings)
fix up highdim examples, allow cell-arrays in findGridInterpBasePt

Last change is a bit intrusive so I left the old behavior (at least for now)
bug fix in refinement stencil code