added __all__ error messages to schema field editor
added __all__ error messages to schema field editor

amcat/amcat,amcat/amcat,tschmorleiz/amcat,tschmorleiz/amcat,tschmorleiz/amcat,amcat/amcat,amcat/amcat,tschmorleiz/amcat,amcat/amcat,tschmorleiz/amcat,amcat/amcat