Auto translation of input flags

Addresses #451 (closed)

saqc/core/core.py

@@ -65,7 +65,7 @@ class SaQC(FunctionsMixin):
         | None = None,
         scheme: str | TranslationScheme = "float",
     ):
-        self._scheme: TranslationScheme = self._initTranslationScheme(scheme)
+        self.scheme: TranslationScheme = scheme
         self._data: DictOfSeries = self._initData(data)
         self._flags: Flags = self._initFlags(flags)
         self._attrs: dict = {}
@@ -129,7 +129,14 @@ class SaQC(FunctionsMixin):
 
     @scheme.setter
     def scheme(self, scheme: str | TranslationScheme) -> None:
-        self._scheme = self._initTranslationScheme(scheme)
+        if isinstance(scheme, str) and scheme in TRANSLATION_SCHEMES:
+            scheme = TRANSLATION_SCHEMES[scheme]()
+        if not isinstance(scheme, TranslationScheme):
+            raise TypeError(
+                f"expected one of the following translation schemes '{TRANSLATION_SCHEMES.keys()} "
+                f"or an initialized Translator object, got '{scheme}'"
+            )
+        self._scheme = scheme
 
     @property
     def _history(self) -> _HistAccess:
@@ -153,7+160,7 @@
             setattr(new, attr, copyfunc(getattr(self, attr)))
         return new
 
     def __copy__(self):
         return self.copy(deep=False)
 
     def __deepcopy__(self, memodict=None):