the stack

(To avoid having many empty models in the stack, we reuse the current
model if it's empty. Maybe we shouldn't try to be this clever: not
sure...)

added File->Clear + changed behaviour of File->New (now just adds a
new model)

allow smaller fonts for palettes (test with "-deltafontsize")

use display list for 3d arrows (approx. 2x speedup on my laptop for
large vector views) and spheres

removed static quadrics (wrong when \exists multiple gl contexts),
replaced with correct(?) init in drawContext

- fix bb computation to avoid model jumping around when adding points in z=0 plane
- pass interpol matrices as ref

fix compilation problem with gcc4.3.2

- added automatic transfinite corner selection for volumes

window with experimental tree browser

fix for "implicit" transfinite surfaces

rewrote generic newton with fd.

last func using GSL is minimize_N.

removed parFromPoint and closestPoint from GEdge; replace their use in
cgns code by appropriate reparamMeshVertex calls (not tested: I don't have
cgns)

removed now unused golden section minimizer (brent), now unused

More "numeric" work: removed all traces of Numerical Recipes, as the
NR license is incompatible with our use. Replaced with Lapack for
LU/SVD. Still need to recode newt & brent.

replace touchSubmatrix() & co with copy()

full code now works without GSL (even ho)