interface simplified and a few bugs removed

interface simplified and a few bugs removed

- array macros renamed and extended
- CF_FUNCTION renamed to CF_PARSER, and a number of parameters and a
  pointer to the target variable are passed into the parser function
- init-, commit-, and parser-hooks only get parameters that they need and
  they get it in a nice way so that they don't have to work much
- fixed CHECK_VAR_TYPE and a few other thingies