* src/util.c (make_tempfile): Do not create temporary files in the final output
directory when in dry-run mode: the path may be read-only.  In addition, we do
not want to leave intermediary empty output directories around.

* patch.1: Use higher-level markup that translates better into HTML and other
formats.  (With changes by Andreas Gruenbacher.)

Doing so prevents bootstrapping with bleeding-edge autotools,
because of harmless deprecation warnings (that are not planned
to become hard errors for at least a few years to come).  And
unfortunately, options in AM_INIT_AUTOMAKE take precedence over
those given on the command line (this is a long-time wart of
automake).

* configure.ac (AM_INIT_AUTOMAKE): Drop '-Werror' option.

Copyright-paperwork-exempt: yes
Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

Reported by Thomas Moschny <thomas.moschny@gmx.de>:
src/patch.c (main): Temporary output files are created in the same directory as
the output file.  Make sure to remove them before removing empty files and
their empty ancestor directories; else the directories won't be empty.
tests/remove-directories: Add directory removal test case.
tests/Makefile.am (TESTS): Add new test case.

* patch.man: Clarify the description of option --forward.

* src/patch.c (main): Initialize data structures early enough, before error
paths can access them.
* tests/bad-usage: Test bad command line usage.
* tests/Makefile.am (TESTS): Add bad-usage here.

* tests/create-delete: Skip binary diff test if printf '\0' is broken.

tests/create-delete: Repair 'backup of unmodified file' test.