Don't serialize the absolute path so we can move checkpoints around.

sim/serialize.cc:
sim/serialize.hh:
    export the checkpoint directory

--HG--
extra : convert_revision : ba5b796fd930ab0487a502beefcf76bd6bb7c366

sim/serialize.cc

@@ -431,7 +431,7 @@ Serializable::create(Checkpoint *cp, const std::string &section)
 
 Checkpoint::Checkpoint(const std::string &cpt_dir, const std::string &path,
                        const ConfigNode *_configNode)
-    : db(new IniFile), basePath(path), configNode(_configNode)
+    : db(new IniFile), basePath(path), configNode(_configNode), cptDir(cpt_dir)
 {
     string filename = cpt_dir + "/" + Checkpoint::baseFilename;
     if (!db->load(filename)) {

sim/serialize.hh

@@ -210,6 +210,8 @@ class Checkpoint
     Checkpoint(const std::string &cpt_dir, const std::string &path,
                const ConfigNode *_configNode);
 
+    const std::string cptDir;
+
     bool find(const std::string &section, const std::string &entry,
               std::string &value);