correct (= up-to-date) Examples in tests/

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2488 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
big changes to ordisurf in one nice commit that can be reverted easily. See Changelog for details.

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2490 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
build formulae for different options and fit via a single gam call, not via separate hard-coded gam calls; also allows nicer printing of the actual formula used

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2491 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
adds fx argument to fit fixed degree freedom regression splines

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2492 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
some of the bases don't work in 2-D 's()' smooths; 'fx = TRUE' and 'select = TRUE' are not compatible; updated all examples to reflect new defaults and options; updated the help page significantly with new notes, warnings etc.

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2493 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
update tests/Examples for ordisurf changes

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2494 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Merge branch 'r-forge-svn-local'