Fix a couple of issues that deal with the RAiDER bias compared to GNSS

.gitignore

@@ -35,3 +35,4 @@ orbits/
 /GUNW*.yaml
 /*.tif
 .coverage*
+TODO.md

CHANGELOG.md

@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [PEP 440](https://www.python.org/dev/peps/pep-0440/)
 and uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+### Changed
+* [802](https://github.com/dbekaert/RAiDER/pull/802) - Update the CDS API to request all dates simultaneously when pulling model levels
+- Use the `era5-pressure-levels` archive when accessing pressure level data. 
+- add unit tests to cover the changes
+* [795](https://github.com/dbekaert/RAiDER/pull/795) - use xarray.open_dataset instead of load_dataset for memory efficiency. Also convert GNSS heights to geoid instead of native ellipsoid for increased accuracy when intersecting with the weather model cube
+
 ## [0.6.0]
 ### Removed
 * [764](https://github.com/dbekaert/RAiDER/pull/764) - Removed Python 3.8 support. Python 3.9 is now the minimum version officially required to run RAiDER.

pytest.ini

@@ -1,3 +1,4 @@
 [pytest]
 markers =
     long: mark a test as a long
+    network: mark a test as requiring external network access (e.g. PROJ CDN for EGM96 grids)