Do not .init on clone!
Add `modifyList` semantics to .set.decomposition
Allow column/row.projector be a vector
Add PSSA examples to mans
Make nspecial method public
PSSA: degree -> dimension

Change row.projector/column.projector arguments meaning: if it is numeric,
it will be interpreted as subspace dimension rather than polynomial degree
PSSA examples upd
PSSA bug fix

.init-method should return object itself (needed for clone-method)
Add 'centering' variant for projection basis

Synonim to 'constant'. Thanks to NG
First cut of OSSA
Add wcor.ossa
Add F-orth checkings in plot.contrib
Add OSSA tests
IOSSA and FSSA description
Merge pull request #131 from eodus/ossa25jan

Merge OSSA-related stuff for fixing and more review