[CHANGESET] updated print.m

[Benjamin Lindner]

> 
> I've pushed this changeset. If anyone has trouble printing let me know 
> (particularly on Windows).
> 

I did a check using print.m on mingw32 (not printing to hardware) using 
this simple test sequence:

plot(0:0.1:10, sin(0:0.1:10), "@-;sin;", 0:0.1:10, cos(0:0.1:10), 
"@-;cos;");
print -depsc2 test.eps
print -dpsc2  test.ps
print -dpng   test.png
print -demf   test.emf
print -dpdf   test.pdf

and all work except the pdf output.

I suggest the attached two changesets for the windows users:
  1) ensure that gnuplot_binary is quoted when used, because it may 
contain spaces (this sadly happens quite frequently under windows).

  2.a) in print.m, for the same reason, ensure that ghostscript_binary 
is always quoted when used.
  2.b) use double quotes, since cmd.exe does not seem to understand 
single quotes.
  2.c) the windows binary of ghostscript uses the environment variable 
GSC as location for the console ghostscript binary. I added code in 
print.m to test for %GSC% and use it, and default to "gswin32c" otherwise.
  2.d) single-quote the output file name in gnuplot_drawnow.m to allow 
for backslash file separators. Otherwise 
print("-demf","t:\\temp\\test.emf") will not work, while 
print("-demf","t:/temp/test.emf") works.

With this I get working output for all 5 file formats.

Somethig else I realized: gnuplot's pdfcairo terminal is not recognized, 
so even while gnuplot has a direct pdf output terminal, print.m uses the 
indirect way ps->pdf via ghostscript.

benjamin
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