Merge branch 'bugfix-turblib_files' into develop
minor: remove code maturity comment from README
add time option to interp test

TODO: take into account moving grid for channel.
directly specify C files from turblib to include
update divergence notebook
add time array for channel info
add test of interp DB
add minor automatization to clib generation
plot all errors in test_interp_DB notebook
DB test --- normalize div error "correctly"
remove superfluous code
add dictionary with interpolation names
grid_spline: simplify get_indices from c file
use nested for loops in spline formula (C file)
interpolator: use component-wise options
interpolator: save coeffs in per-direction file
interpolator: use cPickle instead of pickle

things are a little faster now...
fix interpolator shared library name
add initialize function to interpolator

clib functionality available without it being called, i.e. no need to
load .gz files if the .so is already there.
Merge branch 'refined_interpolation' into develop