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/res_test.py

@@ -9,6 +9,7 @@ def result():
     except:
         print("h5 already opened")
     accu = Accumulation(error=False)
+
     for num,ts in enumerate(results):
         data["accu"] = accu
         data["data/ts %i"%num] = ts+0
@@ -17,6 +18,7 @@ def result():
         r[num] = ts.y[0][0]
         data["test"] = r
         accu+=ts
+        print(accu)
     accu.write_to_hdf(h5, "/", "name", "title")
     try:
         h5.close()