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

lots of improvements to boundary layer generation: we can now constuct
and mesh models with entities connected to boundary layer points, edges
and faces

fix position of BoundaryLayerPoints

better destructor

* re-added all view output routines (POS, STL, MSH, TXT)

- re-add smooth() for PViewDataList

rewrote Draw_Scale

fix bug for ruled surfaces with holes (part 1)