Python updates (#38)

* silence SFINAE disabled for fork_gotcha

* Python updates

- Options for --{module,function}-include
- libpyomnitrace is_initialized and is_finalized
- source instrumentation auto init
- atexit finalization
- improved python testing

* Documentation Update

* Fix to 'cmake -E cat' not available < cmake v3.18

* Fix for inverse tests

* Update cancelling.yml

source/python/omnitrace/__init__.py

@@ -43,6 +43,8 @@ try:
     )
     from .libpyomnitrace import initialize
     from .libpyomnitrace import finalize
+    from .libpyomnitrace import is_initialized
+    from .libpyomnitrace import is_finalized
     from .libpyomnitrace.profiler import config as Config
 
     config = Config
@@ -52,6 +54,8 @@ try:
     __all__ = [
         "initialize",
         "finalize",
+        "is_initialized",
+        "is_finalized",
         "Profiler",
         "Config",
         "FakeProfiler",
@@ -63,5 +67,13 @@ try:
         "noprofile",
     ]
 
+    import atexit
+
+    def _finalize_at_exit():
+        if not is_finalized():
+            finalize()
+
+    atexit.register(_finalize_at_exit)
+
 except Exception as e:
     print("{}".format(e))