Towards v0.9, conda install, update package versions etc.

[kushalkolar]

• [ ] conda install process: install mesmerize in conda env after installing caiman
• [ ] Check that latest pandas works with h5py v2.10.0
• [ ] update mesmerize tslearn stuff to work with latest tslearn and latest sklearn
• [ ] check that stuff works with latest matplotlib
• [ ] latest seaborn
• [ ] latest spyder, or remove spyder stuff
• [x] make bokeh optional
• [x] make nuset optional
• [x] allow decimal values for min_snr and min_pnr in cnmfe, @EricThomson
• [x] fix script editor HOME env var problem in Windows
• [x] require python3.8
• [ ] release VM with mesmerize v0.9
• [ ] save tiff files using image=False, this flag is undocumented
• [ ] export ROI manager stuff to csv, see #91 , contributed by @EricThomson