Fix a typo in the command-line help
Remove configuration files for paper size.

As a result, remove paperconfig.

The PAPERSIZE variable and, where supported, LC_PAPER, are the two
remaining mechanisms for configuration of paper size.
Ensure we have Perl in configure.ac
Rewrite paperinfo in Perl plus a small C program localepaper.

As a result, none of the original code remains, so bump the license to
GPLv3+.

Because we only have a trivial C program, remove the requirement for
C99, and the GCC warnings apparatus from configure.ac.

Adjust make syntax-check exclusions.