tweak 2d graph + other small fixes

all that was there is back (can be enhanced later)

start reintro high order rep

fix crash in batch mode

don't remove duplicates when picking individual elements (since some
elements might then never have a pickable entity)

rewrote vertex array code for meshes in the same way we do it now for
post-processing (much simpler, pretty much same speed, and takes a bit
less memory)

fix reload

use time vals if avail

cleanups

reinterfaced adaptive views with new post-pro

upgraded all plugins to work with the new post-pro.

This is done "cheaply" for now, by only using old-style list-based datasets.
Taking advantage of the abstraction (so that we can use the plugins on all
datasets) will require more work. The hooks for transparent data translation
are in place, but the actual translation has not been implemented yet.

- fixed 2d time plots
- better 2d space plots when absissa not monotone

moving to new post-processing database

                    *** WARNING ***

do not upgrade if you need plugins or adaptive view: these have not
been ported (yet) to the new database

                    *** WARNING ***

moving to new post-processing database

                    *** WARNING ***

do not upgrade if you need plugins or adaptive view: these have not
been ported (yet) to the new database

                    *** WARNING ***

moving to new post-processing database

                    *** WARNING ***

do not upgrade if you need plugins or adaptive views: these have not
been ported (yet) to the new database

                    *** WARNING ***

airplane work: more work to complete remaing features (read, combineSpace,
combineTime) in new post-pro

fix logic for unconstrained bgmesh

add Function Field and Intersect examples

allow Function Field(1)="expression"; (without extra empty list at the end)

added simple boundary operator in parser