Name: which_hessi_version

 Purpose: Function to return a string "Development Version" or "Release X" depending on
   which version of the software is in the path.

 Calling sequence:  dev_or_rel = which_hessi_version(routine)

 Input arguments:
	routine - string name of routine to find.  If none provided, looks for hsi_image__define.pro

 Output Keywords:
   date - returns the date of the release, if release, or the current date, if development

 Written: Kim Tolbert, Nov 29, 2000
 CALLS:
 CALLED BY
	hessi_version, hsi_widget_title

 NAME:  wrt_photon_list
	
 PURPOSE: write a file with histograms of photons binned in rotation angle
	
 CALLING SEQUENCE: 

	
 INPUTS: 
	
	filename - name of photon angle bin file to write
	photon_lists - photon histograms binned into equal angles
		      nominally a lonarr(max(rot_bins),12, number_energies, number_times)
	rot_bins - number of angle bins used for each collimator

	datacube 
		Up to four dimensional datacube in x, y, energy, and time.
		x and y refer to the spatial dimensions in pixels, 1 arcsecond default.
		The value of the datacube at each point is the counts 
		which would be measured by a detector unmodulated by the grids (rmc's).
		The average transmission through the rmc's is 25% for perfect black grids.
		The number of pixels in x and y must be equal.	
	collimator_pitches - 12 values, pitch of each collimator
	x0 - offset from telescope axis to image field along first index in arcseconds
	y0 - offset from telescope axis to image field along second index in arcseconds

 OPTIONAL INPUTS:
	secs_per_pix -  number of arcseconds per pixel, 
	edges - 2 x number_energies energy bins (keV)
	time - 2 x number_times time bins (seconds)
	doc_out  - text with even more information about the creation of the data file
 PROCEDURE:
	Reads in data file created by make_lists.pro
	For each collimator pitch there is a histogram of events grouped
	by their rotation angle.  This histogram is returned 
 CALLS: ***
	CHECKVAR [1], checkvar [2]
 COMMON BLOCKS:
	wrt_photon_list
 RESTRICTIONS:

 MODIFICATION HISTORY:
	ras, 24-feb-95