NISAR edge-effects 

These products are still having some edge effects.
We should just check if the current edge masking approach using the included mask in the product is behaving as expected.

```
ariaDownload.py --bbox '50.61 52.45 4.86 8.44' -t 066 --mission NISAR -w GUNWs
ariaTSsetup.py -f 'GUNWs/*.h5'   -nt 10 -l solidEarthTide,troposphereTotal,ionosphere -w aria_tools 
```