- 0.1.4 Wednesday, August 27 19:07:46 KST 2014, jhlee
          * introduce clear_add_env in order to re-use code
            Four entries ($EPICS_BASE, $EPICS_EXTENSIONS,
            $RAON_SITELIBS, $RAON_SITEAPPS) should be reset
            in $PATH, $LD_LIBRARY_PATH
          * Remove a routine to touch RELEASE in extensions,
            because we don't need it anymore
          * clear some codes for better structuring...