dev-ml/*: improve metadata

Signed-off-by: Alessandro Barbieri <lssndrbarbieri@gmail.com>

dev-ml/configurator/metadata.xml

@@ -1,11 +1,21 @@
-<?xml version='1.0' encoding='UTF-8'?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
 	<maintainer type="person">
 		<email>lssndrbarbieri@gmail.com</email>
 		<name>Alessandro Barbieri</name>
 	</maintainer>
+	<longdescription lang="en">Configurator is a small library that helps writing OCaml scripts that
+test features available on the system, in order to generate config.h
+files for instance.
+
+Configurator allows one to:
+- test if a C program compiles
+- query pkg-config
+- import #define from OCaml header files
+- generate config.h file</longdescription>
 	<upstream>
+		<bugs-to>https://github.com/janestreet/configurator/issues</bugs-to>
 		<remote-id type="github">janestreet/configurator</remote-id>
 	</upstream>
 </pkgmetadata>