Added degcol logger to extrema and prog-extrema.

Degree of collocation logger (or task share variance logger) was
only present in pcp.go. Copied that code into extrema and prog-extrema.
Also, exposed visibility of pcp/utils.go#cpuUtilsPerNode(...) and
pcp/utils.go#memUtilsPerNode(...) to public.

pcp/pcp.go

@@ -55,10 +55,10 @@ func Start(quit chan struct{}, logging *bool, logMType chan elekLogDef.LogMessag
 
 			seconds++
 
-			memUtils := memUtilPerNode(text)
+			memUtils := MemUtilPerNode(text)
 			memTaskShares := make([]float64, len(memUtils))
 
-			cpuUtils := cpuUtilPerNode(text)
+			cpuUtils := CpuUtilPerNode(text)
 			cpuTaskShares := make([]float64, len(cpuUtils))
 
 			for i := 0; i < 8; i++ {