aurorax_atm_inverse_get_output_flags

;-------------------------------------------------------------
;+
; NAME:
;       AURORAX_ATM_INVERSE_GET_OUTPUT_FLAGS
;
; PURPOSE:
;       Initialize ATM 'inverse' calculation output flag settings.
;
; EXPLANATION:
;       Create an hash object which used to represent all output values included in
;       an ATM inverse calculation. ATM calculations are performed in a way where
;       you can toggle ON/OFF whichever pieces of information you do or don't want.
;       This improves efficiency of the calculation routine resulting in faster queries.
;
;       By default, all output flags are disabled. There exist several helper keywords
;       to enable all flags, or enable only height-integrated Rayleighs flags.
;
; CALLING SEQUENCE:
;       aurorax_atm_inverse_get_output_flags()
;
; KEYWORDS:
;       /SET_ALL_TRUE          enable all output flags to
;
; OUTPUT
;       Output flags hash
;
; OUTPUT TYPE:
;       a hash
;
; EXAMPLES:
;       aurorax_atm_inverse_get_output_flags()
;       aurorax_atm_inverse_get_output_flags(/SET_ALL_TRUE)
;+
;-------------------------------------------------------------