Updated copyright year.

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1054 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Delimit mutool options from filename arguments.

From: Benoit Pierre <benoit.pierre@gmail.com>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1055 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Wait for all mutool calls to terminate.

From: Benoit Pierre <benoit.pierre@gmail.com>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1056 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Minor code simplification

From: Benoit Pierre <benoit.pierre@gmail.com>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1057 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Improved thread names.

From: Benoit Pierre <benoit.pierre@gmail.com>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1058 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Additional debug output for extractor.

From: Benoit Pierre <benoit.pierre@gmail.com>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1059 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Print traceback when callback fails.

From: Benoit Pierre <benoit.pierre@gmail.com>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1060 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Catch errors from worker threads.

From: Benoit Pierre <benoit.pierre@gmail.com>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1061 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Upgrade log level to WARNING on startup.

From: Benoit Pierre <benoit.pierre@gmail.com>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1062 ef8490bc-f317-4725-81ed-e95a9aca1bcf
Use subprocess32 for spawning processes when available.

This should avoid Python issue #1336, forking processes is
not thread-safe.

From: Benoit Pierre <benoit.pierre@gmail.com>

git-svn-id: svn+ssh://svn.code.sf.net/p/mcomix/code@1063 ef8490bc-f317-4725-81ed-e95a9aca1bcf