Christophe CURIS 34ca63c59f wrlib: Improved NETPBM support ...

- re-add PPM to the list of supported format, because legacy apps may
expect to find it from the list;

- add the copyright notice related to the code that have been borrowed
from Netpbm;

- fixed a small error in PPM format check in the loading procedure;

- and a few minor code improvements

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
Signed-off-by: Carlos R. Mafra <crmafra@gmail.com>

2014-04-24 10:56:50 +01:00

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