* app/tools/transform_options.[ch]: Separated the transform
    options stuff from the gimptransformtool files so that each
    of the transform tools to make is available to the other transform
    tools.

  * app/tools/gimptransformtool.c
  * app/tools/gimpscaletool.c
  * app/tools/gimpsheartool.c
  * app/tools/gimprotatetool.c
  * app/tools/gimpperspectivetool.c
  * app/tools/Makefile.am: Changed accordingly