Update of README and INSTALL files

INSTALL

@@ -1,13 +1,20 @@
 WeeChat - Installation instructions
 ===================================
 
-1) Run './configure'
-   (./configure --help so see options)
+You can build WeeChat with autotools or cmake.
 
-2) Run 'make'
+- with autotools:
+    ./autogen.sh     (for cloned git repository only)
+    ./configure      ("./configure --help" for options)
+    make
+    make install     (as root for installation in system directories)
 
-3) As root, run 'make install'
+- with cmake:
+    mkdir build
+    cd build
+    cmake ..         ("ccmake .." for options)
+    make
+    make install     (as root for installation in system directories)
 
-4) Enjoy !  :-)
 
 See AUTHORS for support, feel free to contact us for any problem.

README

@@ -9,11 +9,11 @@ It is customizable and extensible with scripts.
 
 Features
 --------
-    * IRC chat client with multi-server connection
+    * chat client with multi-protocol/server connection
     * many GUI (curses, Gtk, Qt) (1)
     * small, fast and very light
     * customizable and extensible with plugins (C, Perl, Python, Ruby, Lua)
-    * compliant with RFC 1459,2810,2811,2812,2813
+    * compliant with IRC RFCs 1459, 2810, 2811, 2812 and 2813
     * developed from scratch
     * multi-platform (GNU/Linux, *BSD, Mac OS X, QNX, Windows & other) (2)
     * 100% GPL & free