[processing] Add flag for algorithms with known issues

Author: nyalldawson

python/core/auto_generated/processing/qgsprocessingalgorithm.sip.in

@@ -45,6 +45,7 @@ Abstract base class for processing algorithms.
       FlagNoThreading,
       FlagDisplayNameIsLiteral,
       FlagSupportsInPlaceEdits,
+      FlagKnownIssues,
       FlagDeprecated,
     };
     typedef QFlags<QgsProcessingAlgorithm::Flag> Flags;

src/core/processing/qgsprocessingalgorithm.h

@@ -75,6 +75,7 @@ class CORE_EXPORT QgsProcessingAlgorithm
       FlagNoThreading = 1 << 6, //!< Algorithm is not thread safe and cannot be run in a background thread, e.g. for algorithms which manipulate the current project, layer selections, or with external dependencies which are not thread-safe.
       FlagDisplayNameIsLiteral = 1 << 7, //!< Algorithm's display name is a static literal string, and should not be translated or automatically formatted. For use with algorithms named after commands, e.g. GRASS 'v.in.ogr'.
       FlagSupportsInPlaceEdits = 1 << 8, //!< Algorithm supports in-place editing
+      FlagKnownIssues = 1 << 9, //!< Algorithm has known issues
       FlagDeprecated = FlagHideFromToolbox | FlagHideFromModeler, //!< Algorithm is deprecated
     };
     Q_DECLARE_FLAGS( Flags, Flag )