* lib/Automake/Wrap.pm, lib/Automake/tests/Wrap.pl: New files.

* lib/Automake/Wrap.pm, lib/Automake/tests/Wrap.pl: New files.
* lib/Automake/Makefile.am (dist_perllib_DATA): Add Wrap.pm.
* lib/Automake/tests/Makefile.am (TESTS): Add Wrap.pl.
* automake.in (handle_texinfo_helper, pretty_print_rule)
(variable_output): Adjust to use makefile_wrap instead of
pretty_print_internal.
(pretty_print_internal): Remove.  Renamed as Automake::Wrap::wrap
and augmented to accept the $eol and $max_len arguments.