fix return-value/deprecated API bugs, accumulation lock leaks, code cleanup

- raise instead of silent None for unsupported operands and empty negation
- validate before acquiring lock in Accumulation operators (no RLock leak)
- Accumulation._copy_provenance helper, ADC_Result._copy_metadata for all result paths
- shared _sandbox_stdout_redirect contextmanager for sandboxed scripts
- TemperatureMonitor dead code removal (gtk helper, traceback, unused properties)
- new unit tests incl. lock-freedom regression test
- gitignore sphinx generated doc/_autosummary/ and doc/damaris/

tests/exp_test.py

@@ -11,6 +11,7 @@ def test(i):
     return e
 
 def experiment():
-    for i in range(1400):
-        sleep(0.1)
-        yield test(i)
+    for i in range(100):
+        #sleep(0.1)
+        yield test(i)
+        synchronize()