Fix task execution andlogging

toolflow/src/main/scala/com/minres/tgc/hammer/Main.scala

@@ -32,10 +32,12 @@ object Main {
         logger.info(s"Executing subcommand ${c.name}")
         val tasks = c.getRequiredTasks
         logger.debug(s"Subcommand requires ${tasks.size} tasks")
-        logger.info(s"Validating tasks")
-        tasks.foreach(_.validate())
-        logger.info(s"Executing tasks")
-        tasks.foreach(_.execute())
+        try {
+          tasks.foreach(_.run())
+        } catch {
+          case e: Exception =>
+            logger.error(s"Error during task execution, see above!")
+        }
       case _ =>
         logger.error(s"Found no subcommand, see help below")
         conf.printHelp()