preflight/postflight instead, so they are run every time a PKG is installed, not only for
  a fresh installation


support-files/MacOSX/Makefile.am:
  - Fix for BUG#11380 (as recommened by JimW): renamed the preinstall/postinstall scripts to
    preflight/postflight instead, so they are run every time, not only for a fresh installation
support-files/MacOSX/postflight.sh:
  - Fix for BUG#11380 (as recommened by JimW): renamed the preinstall/postinstall scripts to
    preflight/postflight instead, so they are run every time, not only for a fresh installation
support-files/MacOSX/preflight.sh:
  - Fix for BUG#11380 (as recommened by JimW): renamed the preinstall/postinstall scripts to
    preflight/postflight instead, so they are run every time, not only for a fresh installation
  - fixed comment typo