* Correct return value when grib_get_length is available.
* Fix coding style.

* There is still work to reconcile C++ header changes with the interface
  generators.

merged trunk into cdi_conversion_c++ and changed type of len in function serializeStrTabGetSize() to int, removed anonymous function in serializeStrTabGetSize() and replaced it with &len

replaced designated initializer with manual initialization for struct varDefZAxisSearchState since c++ does not support this feature, added explicit casts in various files