dot'ify internal function
Introduce new "decomposition" object.
Switch stuff to it. No functionality change.
Normalize the internal .F accessor usage
Make first use of the decomposition stuff: Toeplitz SSA.
Also, make sure the helpers are unaware about the exact layout of the object.
Make U, V, sigma generics. Provide implementations for SSA objects and for decompositiontions
itself.
Grab the decomposition for forecast
Apparently, forecasts require orthonomal bases.
Introduce {row,col}span methods
Give colspan / rowspan routines an idx arg - they do not make sense w/o them
Copy-paste error fix
Add drop=FALSE
Add .colspan for Toeplitz

My first exersize
Typo fix
Add .nspecial generic
Fix warning in .maybe.continue called for empty groups
Allow zero LRRs
Add drift to 'apply.lrr'
Correct classes order for multiclass
Update common test methods and passthrought ellipsis
Remove trailing ;
Allow multi-length fields