mask_and_combine fix exprot error

paper 3 updates

secondary run edits

changes for methodology paper

trialing desc 2020 and 21

update helper files

create identify_activity.ipynb

update and rename mask_and_combine.ipynb

move landslide data outside of repository

update readme

update combine_and_mask

Update README.md

full study area processing

update hyp3 download procedure

download_hyp3_insar_data: add more checks