Update NEWS for 4.2 release

NEWS

@@ -7,14 +7,14 @@ Copyright (C) 2000-2021  Michael Black W9MDB, and others
 Please send Hamlib bug reports to hamlib-developer@lists.sourceforge.net
 
 Version 4.2
-    * 2021-04-27
+    * 2021-05-17
     * New rig_get_mode_bandwidths -- returns token set for bandwidths for given mode
         Rig command: \get_mode_bandwidths CW
         Mode=CW
         Normal=500Hz
         Narrow=50Hz
         Wide=2400Hz
-    * New rig_get_info  -- returns token set for all vfos where order does not matter 
+    * New rig_get_info  -- returns token set for all vfos where order does not matter
       This is a string return to allow for easy future expansion without changing the API
       New tokens may be introduced and can be skipped if not used by clients
         Rig command: \get_rig_info
@@ -37,13 +37,18 @@ Version 4.2
 
     * USRP lib and gnuradio are deprecated and will be removed in 5.0
     * Added Radan rotator
-    * Added Malachite SDR 
+    * Added Malachite SDR
     * Major rework for PRM80
     * Add twiddle_timeout and twiddle_rit --set-conf options
-        rigctld --set-conf=twiddle_timeout=5,twiddle_rit=1 
+        rigctld --set-conf=twiddle_timeout=5,twiddle_rit=1
         This will set the twiddle timeout to 5 seconds and turn on twiddle_rit
-        For twiddle timeout VFOB will not be polled for 5 seconds after VFO twiddling is detected
-    rigctld --twiddle is deprecated and will be removed in 5.0 along with get_twiddle and set_twiddle
+        For twiddle timeout VFOB will not be polled for 5 seconds after VFO twiddling
+	is detected
+    * rigctld --twiddle is deprecated and will be removed in 5.0 along with
+      get_twiddle and set_twiddle
+    * Rework Doxygen manual including default layout for Doxygen 1.9.1.  So far
+      the amplifier, rotator, and utilities API sections have been updated.  The
+      rig (radio) section remains to be updated.
 
 Version 4.1
         2021-01-31