- include/vaucanson/config/pconf-hh.in: Remove. Move to...
- include/vaucanson/config/pconf.hh.in: New. ... here. This file is
now considered as a config header. It only contains #undef's.
- configure.ac: Set pconf.hh.in to be a config header and AC_DEFINE
`VCSN_PACKAGE_*'. Also AC_DEFINE `VCSN_DATA_PATH'.
- include/Makefile.am: Don't put the `.in' file in EXTRA_DIST. Don't
sed(1) pconf-hh.
- config/vcsn.m4: s/IGNORE_PCONF_HH/VCSN_INTERNAL_\0/.
- include/vaucanson/config/system.hh: Likewise. Don't include
`config.h'.

- config/vcsn_xml.m4: Fix typos.