Update heavy_tests.json (#164)

Only run NB tests

Author: casella

configs/heavy_tests.json

@@ -1,22 +1,4 @@
 [
-  {
-    "library":"ScalableTestSuite",
-    "libraryVersion":"master",
-    "libraryVersionNameForTests":"OB",
-    "ulimitOmc":400,
-    "ulimitExe":300,
-    "ulimitMemory":62914560,
-    "procOMC":0,
-    "procCCompile":0,
-    "optlevel":"-O0 -march=native",
-    "referenceFileExtension":"mat",
-    "referenceFileNameDelimiter":".",
-    "referenceFinalDot":"_res.",
-    "referenceFiles":{
-      "giturl":"https://github.com/casella/ScalableTestSuite-ref",
-      "destination":"ReferenceFiles/ScalableTestSuite"
-    }
-  },
   {
     "library":"ScalableTestSuite",
     "libraryVersion":"master",