2000-02-15  Tor Lillqvist  <tml@iki.fi>

* libgimp/gimp.def
* libgimp/gimpui.def
* libgimp/makefile.{cygwin,msc}
* app/makefile.{cygwin,msc}
* plug-ins/makefile.{cygwin,msc}: Updates.

* app/datafiles.c (is_script): New Win32-only function, which
tests if a file's extension matches one of the extensions in the
PATHEXT environment variable (which the cmd.exe command
interpreter also uses). This is to avoid starting applications
associated with any random data file the user might have dropped
in the plug-ins folder, while still supporting plug-ins written in
scripting languages.

* app/gimpparasite.c (gimp_parasiterc_save): (Win32:) Cannot
rename to an existing file.

* plug-ins/Lighting/lighting_image.c
* plug-ins/Lighting/lighting_share.c
* plug-ins/MapObject/mapobject_preview.c
* plug-ins/MapObject/mapobject_shade.c: Use G_PI.

* plug-ins/common/gz.c: #ifdef G_OS_WIN32 was used before its
potential definition via glib.h.

* plug-ins/common/jpeg.c: Also recognize Exif files, which are
typically produced by digital cameras. The usually have a .jpg
file name extension, and would thus already match this plug-in,
but add the magic string just in case. They are loaded just fine
by libjpeg even if they don't have the JFIF signature.

* plug-ins/common/tiff.c: Set TIFF warning and error handler, so
we get to pass libtiff's messages through the normal channels.