Refactor code to have a single Ellipsoid class

doc/api/index.rst

@@ -86,16 +86,12 @@ Magnetic fields:
     ellipsoid_magnetic
     prism_magnetic
 
-Ellipsoids:
+Geometric bodies:
 
 .. autosummary::
     :toctree: generated/
 
-    create_ellipsoid
-    OblateEllipsoid
-    ProlateEllipsoid
-    Sphere
-    TriaxialEllipsoid
+    Ellipsoid
 
 Layers and meshes:
 

harmonica/__init__.py

@@ -16,15 +16,7 @@
 from ._equivalent_sources.spherical import EquivalentSourcesSph
 from ._euler_deconvolution import EulerDeconvolution
 from ._forward.dipole import dipole_magnetic
-from ._forward.ellipsoids import (
-    OblateEllipsoid,
-    ProlateEllipsoid,
-    Sphere,
-    TriaxialEllipsoid,
-    create_ellipsoid,
-    ellipsoid_gravity,
-    ellipsoid_magnetic,
-)
+from ._forward.ellipsoids import Ellipsoid, ellipsoid_gravity, ellipsoid_magnetic
 from ._forward.point import point_gravity
 from ._forward.prism_gravity import prism_gravity
 from ._forward.prism_layer import DatasetAccessorPrismLayer, prism_layer

harmonica/_forward/ellipsoids/__init__.py

@@ -8,12 +8,6 @@
 Forward modelling of ellipsoids.
 """
 
-from .ellipsoids import (
-    OblateEllipsoid,
-    ProlateEllipsoid,
-    Sphere,
-    TriaxialEllipsoid,
-    create_ellipsoid,
-)
+from .ellipsoids import Ellipsoid
 from .gravity import ellipsoid_gravity
 from .magnetic import ellipsoid_magnetic