codes --> ccodes refactor, fixed bug in get_codebookcodes which caused hitting the database even when cached
codes --> ccodes refactor, fixed bug in get_codebookcodes which caused hitting the database even when cached

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