added stack control to PER

skeletons/asn-decoder-template.c

skeletons/asn_codecs.h

skeletons/asn_internal.h

skeletons/ber_decoder.c

skeletons/ber_decoder.h

skeletons/ber_tlv_length.c

skeletons/ber_tlv_length.h

skeletons/constr_CHOICE.c

skeletons/constr_SEQUENCE.c

skeletons/constr_SET_OF.c

skeletons/per_decoder.c

skeletons/per_decoder.h

skeletons/per_support.c

skeletons/per_support.h

skeletons/xer_decoder.c

skeletons/xer_decoder.h