Add progress tracking into a file

This changeset adds progress tracking for
CERN's next Computing Challenge https://test4theory.cern.ch/challenge/

openMalaria now creates a file named "progress" and writes a number into it,
which represents progress of a workunit.

For more information see: https://boinc.berkeley.edu/trac/wiki/BasicApi#progress

model/util/BoincWrapper.cpp

@@ -126,6 +126,15 @@ namespace BoincWrapper {
 
   void reportProgress (double progress) {
     boinc_fraction_done (progress);
+	// Changeset for CERN Compute Challenge 2015 (below)
+	//
+	// this writes a number which represents the progress
+	// into a file named progress
+	// progress should be a double with range 0 to 1
+	// see https://boinc.berkeley.edu/trac/wiki/BasicApi#progress for further reference
+	ofstream outfile ("progress");
+	outfile << progress << endl;
+	outfile.close();
   }
 
   int timeToCheckpoint() {