Fixed installer bugs, added documentation for crop function.

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@578 0fc631ac-6414-0410-93d0-97cfa31319b6

doc/function/crop.txt

@@ -0,0 +1,15 @@
+Function: crop
+
+--Usage--
+> crop(input: image, height: height_of_new_image, width: width_of_new_image, offset_x: x_position_to_start_crop, offset_y: y_position_to_start_crop)
+
+Shrink an image by cutting off some of the image, starting at the position denoted by the offsets. The resulting image size is specified in the parameters.
+
+--Parameters--
+! Parameter		Type				Description
+| @input@		[[type:image]]		Image to enlarge
+| @height@		[[type:double]]		Height of the resulting image
+| @width@		[[type:double]]		Width of the resulting image
+| @offset_x@	[[type:double]]		Offset of crop, horizontally
+| @offset_y@	[[type:double]]		Offset of crop, vertically
+

doc/function/index.txt

@@ -65,6 +65,7 @@ These functions are built into the program, other [[type:function]]s can be defi
 | [[fun:set_alpha]]		Change the transparency of an image.
 | [[fun:set_combine]]		Chnage how the image should be combined with the background.
 | [[fun:enlarge]]		Enlarge an image by putting a border around it.
+| [[fun:crop]]		Crop an image, giving only a small subset of it.
 | [[fun:drop_shadow]]		Add a drop shadow to an image.
 | [[fun:symbol_variation]]	Render a variation of a [[type:symbol]].
 | [[fun:built_in_image]]	Return an image built into the program.