wam: Make our _info.cfg's look identical to the C++ client's

To achieve this, add the same leading comment section ("do no edit this
file", etc.) and use the same indentation format as the C++ engine, and
don't use quotes around the uploads attribute value (it's an integer).

data/tools/wesnoth_addon_manager

@@ -134,16 +134,20 @@ if __name__ == "__main__":
             info = os.path.join(dirname, "_info.cfg")
             try:
                 f = file(info, "w")
-                infowml = """[info]
-version="%s"
-uploads="%s"
-dependencies="%s"
-title="%s"
-type="%s"
+                infowml = """#
+# File automatically generated by Wesnoth to keep track
+# of version information on installed add-ons. DO NOT EDIT!
+#
+[info]
+\tdependencies="%s"
+\ttitle="%s"
+\ttype="%s"
+\tuploads=%s
+\tversion="%s"
 [/info]
 """
                 f.write(infowml %
-                    (version, uploads, dependencies, title, type))
+                    (dependencies, title, type, uploads, version))
                 f.close()
             except OSError:
                 pass