* plug-ins/makefile.msc: New file.

	* plug-ins/*/*.c (Well, not really all files, but many):
 	Portability fixes. Include config.h, and guard inclusion of POSIX
 	and Unix headers like <unistd.h>, <dirent.h> and
 	<sys/time.h>. Include <string.h> if functions from it are
 	used. Use g_ntohl() and g_htonl() insteead of ntohl() and htonl(),
 	thus no need to include <netinet/in.h>. Include <io.h> on Win32
 	when using open/read/write (which actually are defined as
 	_open/_read/_write by glib.h). Define S_* macros if necessary on
 	Win32. Define rint() and M_PI if necessary (these definitions
 	should be factored out somewhere, no sense repeating them in lots
 	of files). Open files in binary mode when needed.

	* plug-ins/FractalExplorer/FractalExplorer.c: Use
 	g_malloc()/g_free(). Use g_strdup_printf().

  	* plug-ins/dbbrowser/dbbrowser.c: No need to include <X11/Xlib.h>.

	* plug-ins/destripe/destripe.c: Guard use of SIGBUS.

	* plug-ins/{flame/flame,hrz/hrz,pnm/pnm}.c: No need to check for
 	NULL returns from g_malloc() and g_new() as they abort on failure.
	Use g_strdup_printf().

	* plug-ins/gz/gz.c: Win32 version of running the subprocess.

	* plug-ins/hrz/hrz.c: Win32 version. Use more generic tests for
 	non-Unix (OS/2 and Win32), for instance HAVE_MMAP.

	* plug-ins/script-fu/interp_slib.c: Win32 version of myruntime().

	* plug-ins/script-fu/interp_sliba.c: Handle \\ (escaped backslahsh).

	* plug-ins/script-fu/script-fu-console.c: Bypass on Win32.

	* plug-ins/script-fu/script-fu-scripts.c: Portability fixes. Use
 	g_strdup_printf() instead of separate malloc() and sprintf(). Use
 	g_strescape() for strings being passed to Scheme. Some Win32-only
 	stuff.