xml panorama project format

[Ianiv Schweber]

More comments about the xml format:
-We should change the root element name to something like "panorama"
-Why do we need an image in the output element?
 The contents are not consistent: type and fov have a value element
 and all the others just specify the value.
 I think it should look like:

 <output>
   <type>Rectilinear</type>
   <fov>100</fov>
   <width>2400</width>
   <height>1200</height>
   <feather>20</feather>
   <format>PNG</format>
   <gamma>1</gamma>
   <interpolator>Poly16</interpolator>
   <qulity>90</quality>
 </output>

Ianiv