CDBurner XP 4.2.7.1849

Changelog:

   * Added exit codes to command line version (0= no error)
   * Fixed the task dialog information icon being shown as question
   * Fixed: CDBurnerXP disappears when switching desktops with Dexpot
   * Fixed an unnecessary error message "... is an invalid character"
   * "0" disc numbers are no longer printed on covers
   * Fixed window stae not being restored properly
   * Fixed "Not Implemented" error during silent setup on Win7 (InnoSetup 5.3.7)