simplify/unify flags concatenation workflows

Implemented changes as suggested in #305 (closed)

• I have some problems figuring out the right way of squeezing flags as suggested in #305 (closed). I left a TODO note in the respective code line (funcs.resampling.concatFlags) and are requesting help from either one of you @palmb / @schaefed . (Or finlly a comprehensive documentation of the many pitfalls of history/flags object handling. I am really a bit lost any time i have to deal with those objects.)

saqc/core/modules/resampling.py

@@ -82,9 +82,11 @@ class Resampling:
             "inverse_bshift",
             "inverse_nshift",
             "inverse_interpolation",
+            "match",
         ],
         freq: Optional[str] = None,
         drop: Optional[bool] = False,
+        squeeze: Optional[bool] = False,
         **kwargs,
     ) -> saqc.SaQC:
         return self._defer("concatFlags", locals())