1.7 release updates

Makefile

-export VERSION = 1.6
+export VERSION = 1.7
 
 PKG_CONFIG ?= pkg-config
 

NEWS

+netctl 1.7
+- Fixes for compatibility with Bash 4.3
+- Fix killing of pppd
+- Add is-enabled subcommand to netctl
+- Add Frequency parameter to WPA configuration
+
 netctl 1.6
 - Fixes for bugs introduced in 1.5