* include/hberrors.h
* Changed #define HB_PP_ERR_INCLUDE_SELF to HB_PP_ERR_INCLUDE_CYCLIC
* source/pp/ppcore.c
* Changed "Can\'t #include self \'%s\'" to "Cyclic #include not allowed: \'%s\'"
* Changed self refernce #include detection, to detect any #include of an already opened file.