M665 rework and related issues (all delta's)

- Making M665 compatible with repetier (see
http://reprap.org/wiki/G_code#M665:_Set_delta_configuration)

- M665 B also sets the radius for manual calibration menu

- Converting tower ajustment definitions to arrays - tower angle
corrections compatible with Esher 3D wizzard

- Only tower angles need to be adjustable with M665 and stored to EEPROM
- tower radius and diag rod can be adjusted in the FW only with #define

Marlin/Marlin.h

@@ -302,9 +302,9 @@ float code_value_temp_diff();
   extern float endstop_adj[ABC],
                delta_radius,
                delta_diagonal_rod,
+               delta_calibration_radius,
                delta_segments_per_second,
-               delta_diagonal_rod_trim[ABC],
-               delta_tower_angle_trim[ABC],
+               delta_tower_angle_trim[2],
                delta_clip_start_height;
   void recalc_delta_settings(float radius, float diagonal_rod);
 #elif IS_SCARA