Replace M_TANKverfM0 with M_TANKverf

The M_TANKverfM0 is the same as the M_TANKverf variable
and is not needed anymore.

Refs #1908

ush/minmon_xtrct_costs.pl

@@ -208,7 +208,7 @@
       #--------------------------
       #  move files to $M_TANKverf
       #--------------------------
-      my $tankdir = $ENV{"M_TANKverfM0"};
+      my $tankdir = $ENV{"M_TANKverf"};
       if(! -d $tankdir) {
          system( "mkdir -p $tankdir" );
       } 

ush/minmon_xtrct_gnorms.pl

@@ -414,7 +414,7 @@ sub updateGnormData {
       #--------------------------
       #  move files to $M_TANKverf
       #--------------------------
-      my $tankdir = $ENV{"M_TANKverfM0"};
+      my $tankdir = $ENV{"M_TANKverf"};
       if(! -d $tankdir) {
          system( "mkdir -p $tankdir" );
       }

ush/minmon_xtrct_reduct.pl

@@ -72,7 +72,7 @@
    #----------------------------
    #  copy outfile to $M_TANKverf
    #----------------------------
-   my $tankdir = $ENV{"M_TANKverfM0"};
+   my $tankdir = $ENV{"M_TANKverf"};
    if(! -d $tankdir) {
       system( "mkdir -p $tankdir" );
    }