plot.wcor on lattice
Add 'wcor' type to 'plot.ssa'
Fix numeric error in wcor calculation
Remove whitespace
Typo
Fix name conflict on par 'type'
Add 'ref' and 'symmetric' pars
Change default gpars in plot.paired and plot.vectors
More general '.defaults'
Fix contributions' evaluation + add 'wnorm' method
Use time() in plot.series
(N - 1) / 2 ---> (N + 1) / 2 anywhere
Merge pull request #37 from eodus/plot_pub6

Various changes here and there: better plots, fixed contribution calculations.