Fix bcftools executeables

public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/Tabix.scala

@@ -56,7 +56,7 @@ class Tabix(val root: Configurable) extends BiopetCommandLineFunction with Versi
   var l: Boolean = config("l", default = false)
   var f: Boolean = config("f", default = false)
 
-  executable = config("exe", default = "tabix")
+  executable = config("exe", default = "tabix", freeVar = false)
 
   def versionCommand = executable
   def versionRegex = """Version: (.*)""".r

public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/bcftools/Bcftools.scala

@@ -19,7 +19,7 @@ import nl.lumc.sasc.biopet.core.{ Version, BiopetCommandLineFunction }
 
 abstract class Bcftools extends BiopetCommandLineFunction with Version {
   override def subPath = "bcftools" :: super.subPath
-  executable = config("exe", default = "bcftools")
+  executable = config("exe", default = "bcftools", submodule = "bcftools", freeVar = false)
   def versionCommand = executable
   def versionRegex = """Version: (.*)""".r
   override def versionExitcode = List(0, 1)

public/biopet-extensions/src/main/scala/nl/lumc/sasc/biopet/extensions/samtools/Samtools.scala

@@ -20,7 +20,7 @@ import nl.lumc.sasc.biopet.core.{ Version, BiopetCommandLineFunction }
 /** General class for samtools extensions */
 abstract class Samtools extends BiopetCommandLineFunction with Version {
   override def subPath = "samtools" :: super.subPath
-  executable = config("exe", default = "samtools")
+  executable = config("exe", default = "samtools", submodule = "samtools" ,freeVar = false)
   def versionCommand = executable
   def versionRegex = """Version: (.*)""".r
   override def versionExitcode = List(0, 1)