allow user to omit the leading 0 in --cvar parameter

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@@ -150,7 +150,7 @@ if ! [[ "${NJOBS}" =~ ^[0-9]+$ ]] || [ ${NJOBS} -lt 1 ] ; then
     NJOBS=1
 fi
 
-if ! [[ "${PV_CVAR}" =~ ^(0(\.[0-9]+)?|1(\.0+)?)$ ]] ; then
+if ! [[ "${PV_CVAR}" =~ ^(0(\.[0-9]+)?|\.[0-9]+|1(\.0+)?)$ ]] ; then
     print_warning "--cum-var parameter must be a real number in the interval [0,1]; the default value of 0.99 will be used."
     PV_CVAR=0.99
 fi