General idea is to use the (presently) unused timeline tag 
"tl.science_component.obs_id" as an indicator of which offsets to apply.
Up until now this tag hasn't been used, so is zero for all TL entries.
In the future, it will be possible to simply set this to a non-zero value
when adding a new study to the TL.

Get EIS/AIA offset using John Mariska's routine "eis_aia_offsets.pro" (see
"notes/eis_iris/eis_aia_offsets.txt". This requires an input time.

The hard-wired EIS/SOT offset (0,50) is NOT time-dependent. This offset was
introduced shortly after launch, and has remained constant since then.

So, somehow we have to transmit the time-dependent EIS/AIA offsets into
the (lower-level) routine "eis_get_mirror_position".

Q. How are we gonna do that? Eh?
A. I dunno, mate. I'm off for coffee. See you later.
A. OK, maybe need to transmit both the obs_id and EIS/AIS offsets. Perhaps
   as a structure {obs_id:obs_id,eis_aia:DOUBLE(2)} as an optional input.
   Alternatively, pass the obs_id and time; {obs_id:obs_id,time:0.D} and
   use JTM's routine later to retrieve the offsets.
   Hmmm, I think I prefer the latter. It's slightly simpler ;-)
   
   Or use bunnies?
      
  (\___/)(\___/)(\___/)(\___/)(\___/)(\___/)(\___/)(\___/)(\___/)(\___/)
  (=’.'=)(=’.'=)(=’.'=)(=’.'=)(=’.'=)(=’.'=)(=’.'=)(=’.'=)(=’.'=)(=’.'=)
  (“)_(“)(“)_(“)(“)_(“)(“)_(“)(“)_(“)(“)_(“)(“)_(“)(“)_(“)(“)_(“)(“)_(“)

   OK, obs_id and time it is!
   
   Inputs to "eis_get_mirror_position" are delx, dely, and ra_id. So we have
   required info available at this stage.


___________________________________________________________________________
Which routines/methods call "eis_pointing_offset"?

	eis_cpt_gui				::oplot_pointing				Unused*
	eis_mk_plan_gui			::populate_point_stc			Done
							::oplot_pointing				Done
	eis_get_mirror_position		(delx,dely,ra_id)			Done
	eis_get_xy_point			(sc_x,sc_y,mip,yip,ra_id)	Done
	eis_get_raster_pointing		(start_time,stop_time,		Unused*
								num_days=num_days)
								
 *NOTE*: the "eis_cpt_gui::oplot_pointing" method is actually unused.
 Also, the offsets are NOT applied in "eis_get_raster_pointing".
 So, no change required.
___________________________________________________________________________
Which routines/methods call "eis_get_mirror_position"?

	eis_structure_container	::initialise_raster_pointing	Done
							::update_raster_pointing		Done
							::offset_pointing_coords        Done
	eis_mk_plan_gui			::pointing_inherit_all			Done
							::update_pointing				Done
							::update_x_point				Done
							::update_y_point  (x2)			Done
	eis_xrt_flare_gui		::get_new_mip_and_yip			Done
___________________________________________________________________________
Which routines/methods call "eis_get_xy_point"?

	eis_structure_container	::relative_raster_pointing		Done
							::offset_pointing_mechan		Done
	eis_mk_plan_gui			::pointing_inherit_all			Done
							::get_new_response_structure	Done
							::update_mip					Done
							::update_yip					Done
	eis_xrt_flare_gui		::get_new_solar_coords			Done
___________________________________________________________________________
Which routines/methods call "eis_get_raster_pointing"? This routine looks
for appropriate J-Side pointing files and returns the contents.

	eis_structure_container	::relative_raster_pointing		Unchanged
							::initialise_raster_pointing	Unchanged
	eis_timeline_plot_gui	::get_pointing					Unchanged

*NOTE*: the "eis_pointing_offset" call here is unnecessary!!!!
The returned offsets aren't applied here. So no changes are required.

___________________________________________________________________________

; +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
; JAR 1-Apr-2014. Add "obs_id" and "aia_time" inputs to routine
; "eis_pointing_offset"
obs_id   = s.science_component.obs_id
aia_time = sra.ra_start_time
; +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Notes:

1. 	"eis_mk_plan_gui::pointing_inherit_all" calls both routines
	"eis_get_mirror_position" and "eis_get_xy_point". This is to do with
	the optional button on the Pointing GUI, present for multi-raster
	studies.