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/

src/damaris/gui/BackendDriver.py

@@ -120,7 +120,7 @@ class BackendDriver(threading.Thread):
         self.statefilename=None
         state_files=glob.glob(os.path.join(self.spool_dir,"*.state"))
         while len(state_files)==0:
-            if timeout<0 or self.core_input is None or self.core_input.poll() is not None or self.quit_flag.isSet():
+            if timeout<0 or self.core_input is None or self.core_input.poll() is not None or self.quit_flag.is_set():
                 # look into core log file and include contents
                 logger.error("Backend failed to start: timeout=%s poll=%s", timeout, self.core_input.poll())
                 log_message=''
@@ -156,10 +156,10 @@ class BackendDriver(threading.Thread):
                 break
 
         # wait on flag and look after backend
-        while not self.quit_flag.isSet() and self.is_busy():
+        while not self.quit_flag.is_set() and self.is_busy():
             self.quit_flag.wait(0.1)
 
-        if self.quit_flag.isSet():
+        if self.quit_flag.is_set():
             self.stop_queue()
             while self.is_busy():
                 time.sleep(0.1)