Rename graph.* in the sidechain module to rotamer_graph.*

this avoids confusion with the graph counterpart in the core module

sidechain/pymod/export_graph.cc

 #include <boost/python.hpp>
 #include <boost/python/register_ptr_to_python.hpp>
-#include <promod3/sidechain/graph.hh>
+#include <promod3/sidechain/rotamer_graph.hh>
 #include <promod3/core/export_helper.hh>
 
 using namespace boost::python;

sidechain/src/CMakeLists.txt

@@ -2,7 +2,7 @@ set(SIDECHAIN_HEADERS
   bb_dep_rotamer_lib.hh
   disulfid.hh
   frame.hh
-  graph.hh
+  rotamer_graph.hh
   particle.hh
   rotamer.hh
   rotamer_cruncher.hh
@@ -23,7 +23,7 @@ set(SIDECHAIN_SOURCES
   bb_dep_rotamer_lib.cc
   disulfid.cc
   frame.cc
-  graph.cc
+  rotamer_graph.cc
   particle.cc
   rotamer.cc
   rotamer_cruncher.cc

sidechain/src/sidechain_reconstructor.cc

 #include <promod3/sidechain/sidechain_reconstructor.hh>
 #include <promod3/sidechain/disulfid.hh>
-#include <promod3/sidechain/graph.hh>
+#include <promod3/sidechain/rotamer_graph.hh>
 #include <promod3/core/message.hh>
 #include <promod3/core/runtime_profiling.hh>