lib: intro of the x11 module

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/x11.nit b/lib/x11.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2014 Alexis Laferrière <alexis.laf@xymus.net>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Serices from the X11 library
+module x11 is pkgconfig("x11")
+
+# Open the current display from the environment variables
+#
+# See <http://www.x.org/releases/X11R7.7/doc/man/man3/XOpenDisplay.3.xhtml>
+fun x_open_default_display: Pointer `{
+       return (void*)(long)XOpenDisplay(NULL);
+`}
+
+# Open a specific display
+#
+# `name` is in the format: "hostname:number.screen_number"
+# 
+# See <http://www.x.org/releases/X11R7.7/doc/man/man3/XOpenDisplay.3.xhtml>
+fun x_open_display(name: String): Pointer import String.to_cstring `{
+       return (void*)XOpenDisplay(String_to_cstring(name));
+`}

diff --git a/tests/sav/x11.res b/tests/sav/x11.res
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index 0000000..e69de29