Automatic -a parameter; option to skip memory check; output improvement

wGRR

@@ -27,19 +27,19 @@ display_usage() {
 	echo "${bold}OPTIONS:${normal}"
 	echo "   -p <string>       Path to the mmseqs executable."
 	echo "                        e.g. /usr/local/bin"
-	echo "                        by default the mmseqs binary found in the \"\$PATH\" environment variable will"
-	echo "                        be used, if there is one."
-	echo "                        If wGRR is used on Maestro, MMSeqs will be automatically loaded."
+	echo "                        By default the mmseqs binary found in the \"\$PATH\" environment variable will"
+	echo "                           be used, if there is one."
+	echo "                           If wGRR is used on Maestro, MMSeqs will be automatically loaded."
 	echo "   -o <string>       Base name for the output files."
-	echo "                        by default a random string will be used."
+	echo "                        By default a random string will be used."
 	echo "   -t <integer>      Number of threads to use."
 	echo "                        default: 1"
 	echo "                        recommended: at least 4"
 	echo "                        Note: if wGRR is run on Maestro via sbatch, this number only applies to the"
 	echo "                           MMseqs step"
 	echo "   -a <integer>      Number of genomes comparisons to be performed in each thread."
-	echo "                     Increasing this will decrease the number of tasks to be performed"
-	echo "                     but each task will take longer and use more RAM."
+	echo "                        Increasing this will decrease the number of tasks to be performed"
+	echo "                           but each task will take longer and use more RAM."
 	echo "                        default: auto"
 	echo "   -m <integer>      Max number of simulteaneous tasks."
 	echo "                        Only applicable to Maestro, for the wGRR calculation step."
@@ -73,7 +73,7 @@ fi
 
 if [  $# -lt 1 ] ; then
    display_usage
-   exit 1
+   exit 0
 fi
 
 ## Functions