Implemented efficient time/frequency decomposition filter at epoch level.
Updated online framework to allow for extra dimensions in the signal, besides channels, time points and trials.
Updated flt_fir, flt_iir, flt_window, flt_wavelet to handle extra dimensions in time-series fields gracefully.
Added temporary paradigm RSSD2 using the new filters.
Merge branch 'devel' of https://github.com/sccn/BCILAB into devel