Générer un PDF avec DITA Open Toolkit sous GNU/Linux: simplify procedure

- use latest DITA version
- simplify PDF build
- remove .emacs configuration
- remove extra information

Signed-off-by: Olivier Carrère <carrereo@gmail.com>
Acked-by: Angela Cristina <acristina@redaction-technique.org>
Fix table headers

- replace bold by table syntax for table headers
- remove extra blank table lines

Signed-off-by: Olivier Carrère <carrereo@gmail.com>
Acked-by: Angela Cristina <acristina@redaction-technique.org>