Lazy flag evaluation for lbproc.
Review changes.

 - Add NUM_BITS class attribute
 - Deprecate everything and hide LBProc!
ENH: Optimisation of regrid.
Review actions
Update miniconda install
FF loader table count.
Merge pull request #1431 from cpelley/optim_regrid

ENH: Optimisation of regrid.
ENH: Cached cropped_bounds within regrid
Review changes
Merge pull request #1432 from cpelley/optim_regrid2

ENH: Cached cropped_bounds within regrid
Update travis to latest test-data sha.
Back-port dec_subset.pp test data move.
Fix repr and indexing
Merge pull request #1455 from bjlittle/ff-table-count

FF loader table count.
PP save pseudo-level to lbuser5.
Merge pull request #1457 from bjlittle/pp-pseudo-level

PP save pseudo-level to lbuser5.
Merge remote branch 'upstream/v1.7.x' into merge-v1.7.x
simplified pdt layout
changes to tests to reflect name changes
Merge pull request #1415 from rhattersley/fast-lbproc

Faster access to PPField.lbproc