Add 'nowait' option description to the help

dc-scripts/unipbs

@@ -37,6 +37,7 @@ Options:
   -u --urqmd    path to the UrQMD executable
   -g --unigen   path to the urqmd2u converter executable
   -f --fake     do not submit jobs, just create tree structure
+  -n --nowait   do not wait a few seconds before building and running jobs
   -h --help     print this help
 
 PBS options: this optional arguments will be transfered directly to the qsub command.