Allow unmasked data

[thesamovar]

We could have the option of not providing mask data. Note that we also need to implement random starts for this.

[asobolev]

Dear Dan, Max,

I'm trying to setup the old spikesorting pipeline with Neurosuite and kk2_legacy script, but can't find the format description of the 'fmask' file. Could you please point me to it? I'd highly appreciate.

Thanks very much!

Andrey Sobolev
LMU Munich