Added the "bestmatching" configuration keyword to enable pkg best matching.

See the NEWS file for more information.

data/xbps.conf

@@ -13,6 +13,12 @@
 # Set it to false to disable syslog logging.
 #syslog=true
 
+# Enable package best matching (disabled by default). If enabled a package with
+# the greatest version available in all repositories will be choosen, rather
+# than on the firt package matching the expression.
+#
+#bestmatching=true
+
 ## REPOSITORIES
 #
 # The `repository' keyword defines a repository. A complete URL or absolute