Clean up configure/build-process.

- assume C++ standard-conforming environment
- add a user-option for gnuplot-support
- separate gnuplot-code into declaration and implementation,
  so we can define at EO-build-time whether to use it or not.

Adopt code and Makefiles to above changes.

Some minor fixes.

eo/src/utils/eoGnuplot1DMonitor.cpp

@@ -0,0 +1,82 @@
+//-----------------------------------------------------------------------------
+// eoGnuplot1DMonitor.h
+// (c) Marc Schoenauer, Maarten Keijzer and GeNeura Team, 2000
+/*
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+   Contact: todos@geneura.ugr.es, http://geneura.ugr.es
+             Marc.Schoenauer@polytechnique.fr
+             mkeijzer@dhi.dk
+ */
+//-----------------------------------------------------------------------------
+
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sstream>
+
+#include "eoGnuplot1DMonitor.h"
+#include "eoParam.h"
+
+
+eoMonitor& eoGnuplot1DMonitor::operator() (void)
+{
+  // update file using the eoFileMonitor
+  eoFileMonitor::operator()();
+
+  // sends plot order to gnuplot
+  // assumes successive plots will have same nb of columns!!!
+  if (firstTime)
+    {
+      FirstPlot();
+      firstTime = false;
+    }
+  else
+    {
+      if( gpCom ) {
+	PipeComSend( gpCom, "replot\n" );
+      }
+    }
+  return *this;
+}
+
+
+
+void eoGnuplot1DMonitor::FirstPlot()
+{
+    if (vec.size() < 2)
+    {
+        throw std::runtime_error("Must have some stats to plot!\n");
+    }
+    std::ostringstream os;
+    os << "plot";
+    for (unsigned i=1; i<vec.size(); i++) {
+        os << " '" << getFileName().c_str() <<
+            "' using 1:" << i+1 << " title '" << (vec[i])->longName() << "' with lines" ;
+        if (i<vec.size()-1)
+            os << ", ";
+    }
+    os << '\n';
+    PipeComSend( gpCom, os.str().c_str());
+}
+
+
+
+// Local Variables:
+// c-file-style: "Stroustrup"
+// fill-column: 80
+// End: