Removed trajectory code

Moving the trajectory code to a seperate repo removes the dependency
on GDAL for this repo, simplifying installation.

.github/workflows/python-package.yml

@@ -26,10 +26,9 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
-        sudo apt-get install gdal-bin libgdal-dev
         python -m pip install --upgrade pip
         python -m pip install flake8 pytest
-        if [ -f requirements-testing.txt ]; then pip install -r requirements-testing.txt; fi
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names

pism_ragis/__init__.py

@@ -11,7 +11,5 @@
     "computing",
     "stats",
     "computing",
-    "interpolation",
     "systems",
-    "trajectories",
 ]