Merging updates from R. Zinke and A. Borsa (#58)

* Periodic fitting to InSAR, GNSS. Source specifn for GNSS.

* 0.) my_sites.txt

a) for testing purposes, added a small-volume site (“TEST") over Mojave in early 2019

1.). SES_Environments.ipynb

This notebook should now be run in its entirety when a users sets up a new solid_earth_atbd environment or wants to refresh their current environment.

a) removed all code not related to Solid Earth
b) reordered and renamed workflow steps
c) added missing netrc class definition to Authentication section

2.). ARIA_prep.ipynb

a) table of contents moved to top
b) Environment Setup reordered/refactored in standard format
c) other stylistic changes for consistency across notebooks

3.) Secular_Requirement_Validation.ipynb

a) added minty.objects.coord line to Load Python Packages
b) moved tropospheric correction link/comment into markdown text [Section 3.2]
c) added code to read Incident/Azimuth angles from geometryGeo.h5 [Section 4.2]
d) fixed deprecated code [Section 4.4]: gnss_count = int(gnss_count[0][0])
e) removed unnecesary counter variable in Section 4.4
f) added line to print out reference station in Section 4.6
g) changed "validation approach” to “validation method”
h) removed redundant MintPy velocity plots in two places
i) other stylistic changes for consistency across notebooks

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Co-authored-by: rzinke <[email protected]>