Update versioning

Author: VeckoTheGecko

docs/conf.py

@@ -91,7 +91,7 @@ def is_non_standard_version(version):
     Determine if the given version string has more than 3 components (e.g., from a developer version).
     """
 
-    return len(version.split(".")) > 3
+    return len(version.split(".")) != 3
 
 # based on pandas doc/source/conf.py
 def linkcode_resolve(domain, info):

plasticparcels/__init__.py

@@ -2,4 +2,7 @@
 from plasticparcels.particlefile import *  # noqa
 from plasticparcels.utils import *  # noqa
 
-from plasticparcels._version_setup import __version__, __version_tuple__  # noqa
+try:
+    from plasticparcels._version_setup import __version__  # noqa
+except ModuleNotFoundError:
+    __version__ = "unknown"