paexec:
 - refresh presentation for lvee-2011 and make it a part of documentation
 - trim spaces in -t argument and then check it for emptyness
 - Option -I like in xargs (in combination with -x)
 - Option -n%'node_[1-20,22-30]'
 - Remove dependency from libmaa
 - Use getline/getdelim instead of fgetln as the former are a part of POSIX
 - non-blocking write(2) for sending task to the slave hosts/CPUs.
 - SIGINFO for displaying current status of tasks
 - SIGUSR1 for trying restore connection to dead client hosts
