Experimental code to get parameters from CCDB.

  CCDB must be installed and CCDB_HOME defined before compiling.
  If CCDB_HOME is not defined, hcana is compiled without CCDB support
  scons has not been updated to compile with CCDB support
  To use, instead of gHcParms->Load(filename), do
    gHcParms->OpenCCDB(runnum, ccdb_connection_string)
    gHcParms->LoadCCDBDirectory("hms","h")
    gHcParms->LoadCCDBDirectory("sos","s")
    gHcParms->LoadCCDBDirectory("gen","g")
  Parmaters will be loaded into the same internal gHcParms list as with
  ThcParmList::Load, so no changes to detector classes are needed.
  Scripts to convert existing parameters into CCDB are under development.
  Currently all ccdb constants are loaded as doubles as there is not
  a way to easily query ccdb to get the data type.
  Also strings are not loaded.