message: use addExt for FileNames
diff: #include "rawToAMR.h"
  +#include <errno.h>
  +#include <stdio.h>
  +
  namespace ospray {
  namespace amr {
  @@ -30,14 +33,16 @@ namespace ospray {
  const FileName outFileBase)
  {
  // ALOK: .info is brick metadata
  - FILE *infoOut = fopen((outFileBase + ".info").c_str(), "wb");
  - if (!infoOut)
  + FILE *infoOut = fopen(outFileBase.addExt(".info").c_str(), "wb");
  + if (!infoOut) {
  throw std::runtime_error("could not open info output file!");
  + }
  // ALOK: .data is actual data
  - FILE *dataOut = fopen((outFileBase + ".data").c_str(), "wb");
  - if (!dataOut)
  + FILE *dataOut = fopen(outFileBase.addExt(".data").c_str(), "wb");
  + if (!dataOut) {
  throw std::runtime_error("could not open data output file!");
  + }
  std::ofstream osp(outFileBase + ".osp");
  osp << "<?xml?>" << std::endl;
  