Fixed installer bugs, added documentation for crop function.

doc/function/crop.txt

+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.

src/data/installer.cpp

@@ -21,7 +21,7 @@
 #include <wx/stdpaths.h>
 
 DECLARE_TYPEOF_COLLECTION(String);
-DECLARE_TYPEOF_COLLECTION(PackageP);
+DECLARE_TYPEOF_COLLECTION(PackagedP);
 DECLARE_TYPEOF_COLLECTION(PackageDependencyP);
 DECLARE_POINTER_TYPE(wxFileInputStream);
 DECLARE_POINTER_TYPE(wxZipInputStream);
@@ -85,7 +85,7 @@ void Installer::install(bool local) {
 		else {
 			throw PackageError(_("Unrecognized package type: '") + fn + _("'\nwhile trying to install: ") + p);
 		}
-		Reader reader(openIn(p + _("/") + fn.Mid(4)));
+		Reader reader(openIn(p + _("/") + pack->typeName()));
 		pack->Packaged::reflect_impl(reader);
 		new_packages.push_back(pack);
 	}

src/util/io/package.hpp

@@ -226,6 +226,7 @@ class Packaged : public Package {
   private:
 	bool   fully_loaded;	///< Is the package fully loaded?
 	friend struct JustAsPackageProxy;
+	friend class Installer;
 };
 
 // ----------------------------------------------------------------------------- : IncludePackage