Proposed changes

This is what I did yesterday:

- basicly gave the tests more comprehensive names; put all the
declarations at the top; got rid of the magic negative C-value (renamed
to P + A, O, T)

- "cos(RADIANS(180 + 30 * axis)) * (1 + circles * 0.1 * ((zig_zag) ? 1 :
-1)) * delta_calibration_radius" compiles wrong is zig_zag statement is
without brackets

- DELTA_TOWER_ANGLE_TRIM reset to 3 values (the calcs use the 3th value
to normalize will not compile otherwise)

-Wrote 3 dummies to keep EEPROM lenght the same

-Reset the configs to the 'original' with autocal + menu disabled (but
can be enabled of course)

Marlin/ultralcd.cpp

@@ -1834,7 +1834,7 @@ void kill_screen(const char* lcd_msg) {
       MENU_BACK(MSG_MAIN);
       #if ENABLED(DELTA_AUTO_CALIBRATION)
         MENU_ITEM(gcode, MSG_DELTA_AUTO_CALIBRATE, PSTR("G33"));
-        MENU_ITEM(gcode, MSG_DELTA_HEIGHT_CALIBRATE, PSTR("G33 C-1"));
+        MENU_ITEM(gcode, MSG_DELTA_HEIGHT_CALIBRATE, PSTR("G33 P1 A"));
       #endif
       MENU_ITEM(submenu, MSG_AUTO_HOME, _lcd_delta_calibrate_home);
       if (axis_homed[Z_AXIS]) {