Changes in GraphicsMagick-1.3.8

[Marco Atzeri]

Hi,
testing GM 1.3.8 versus previous 1.3.7 with octave 3.2.4, 
I discovered that from this version:

"The InitializeMagick() function MUST be invoked before constructing any 
Magick++ objects".

http://www.graphicsmagick.org/Magick++/index.html
http://www.graphicsmagick.org/api/api.html

Otherwise a nice crash will happen.

As I see no InitializeMagick call also in the hg source,
Where is the best place to put this call within __magick_read__.cc ?

Marco