`judiDataMute` allow set negative `t0`

[kerim371]

Hi,

Is it possible to add an opportunity to set t0<=0 for judiDataMute? For now it brings bounds access error.

The idea is to mute wavefields near source on land data. I hope that setting t0=-1 (seconds) and vp=600 would mute strong waves near source.

[mloubout]

It should be doable, mainly needs a little bit more checks to see if within the data time range from a negative start time