Update samtools.

workflow/conf/biohpc.config

 process {
   executor = 'slurm'
   queue = 'super'
+  clusterOptions = '--hold'
 
   // Process specific configuration
   $checkDesignFile {
@@ -12,11 +13,11 @@ process {
     cpus = 32
   }
   $alignReads{
-    module = ['python/3.6.1-2-anaconda', 'bwa/intel/0.7.12', 'samtools/1.4.1']
+    module = ['python/3.6.1-2-anaconda', 'bwa/intel/0.7.12', 'samtools/1.6']
     cpus = 32
   }
   $filterReads{
-    module = ['python/3.6.1-2-anaconda', 'samtools/1.4.1', 'sambamba/0.6.6', 'bedtools/2.26.0']
+    module = ['python/3.6.1-2-anaconda', 'samtools/1.6', 'sambamba/0.6.6', 'bedtools/2.26.0']
     cpus = 32
   }
   $experimentQC {
@@ -24,7 +25,7 @@ process {
     cpus = 32
   }
   $convertReads {
-    module = ['python/3.6.1-2-anaconda',  'samtools/1.4.1', 'bedtools/2.26.0']
+    module = ['python/3.6.1-2-anaconda',  'samtools/1.6', 'bedtools/2.26.0']
     cpus = 32
   }
   $crossReads {