* tta/C/main/build_perl_info.c (new_element_perl_data)
(element_to_perl_hash), tta/C/main/tree.c (destroy_element): do not
retain an additional reference in new_element_perl_data, and
consistently do not remove an HV reference in destroy_element.
Call newSVsv instead of SvREFHVCNT_inc in element_to_perl_hash.

* tta/C/main/build_perl_info.c (build_elements_list)
(fill_document_hv, store_document_texinfo_tree): use newSVsv instead
of SvREFHVCNT_inc.

* tta/C/main/build_perl_info.c (build_perl_const_element_array)
(build_perl_directions, build_extra_misc_args)
(build_extra_index_entry): do not retain an additional reference
to the AV/HV.

* tta/C/main/build_perl_info.c (build_perl_array)
(build_perl_container): return an AV.  Update caller.