fix issue #27: use config.toml file instead of xo-server.toml. remove old support for .yaml config

sample.xo-install.cfg

@@ -7,6 +7,9 @@ PORT="80"
 # Base dir for installation and future updates
 INSTALLDIR="/etc/xo"
 
+# Configuration is stored in XOUSER's home directory and by default will be overwritten with every update done by this script. Set CONFIGUPDATE to false if you don't want this to happen
+CONFIGUPDATE=true
+
 # Git branch or tag (append tags/ before the tag name) where xen-orchestra sources are fetched.
 # Also, you can set this to "release" to use the latest tagged branch.
 BRANCH="master"