Bug Fix: utils/cgsymbol_extra.pro

Fix bug whereby the FUNCTION defined in the file utils/cgsymbol_extra.pro was
still called CGSYMBOL.  FUNCTION definition now updated to correspond to routine
name, which itself was changed for conformity with external IDL libraries.
Fix very rare / obscure bug

Fix bug where coincidental "I1" or "I4" is in the GLIMPSE file's full path,
which buggers up the operation.  Change "*I1*" to "*_mosaic_I1.fits",
commensurate with the full filename of GLIMPSE FILES.

This is one of those very-unexpected failure modes, and I'm sure more will crop
up as people start using this code.
	modified:   create_local_files/omni_glimpse_emaf.pro
	modified:   create_local_files/omni_glimpse_starsub.pro
Fix typo and add MODIFICATION HISTORY to previous commit

	modified:   create_local_files/omni_glimpse_emaf.pro
	modified:   create_local_files/omni_glimpse_starsub.pro
Merge branch 'master' into release

Minor bug fixes before release.
Add more useful error messages on not finding files.

Add useful error messages for errors in finding files related to the GLIMPSE /
EMAF routines.  Also, add check in distance_omnibus.pro to actually stop
running if an error occurs during one of the prob_* calls.

	modified:   create_local_files/omni_glimpse_emaf.pro
	modified:   create_local_files/omni_glimpse_starsub.pro
	modified:   distance_omnibus.pro
	modified:   emaf/omni_emaf_morph.pro
	modified:   subroutines/omni_load_ffore.pro
Minor bug fix in VLINE

Fix minor bug in VLINE w.r.t. the /LOG keyword; trying to take the log of a
negative integer returns zero instead of a floating-point number.  Maybe a bit
of overkill to force DOUBLE precision, but RAM is cheap anymore.

	modified:   utils/vline.pro
Return covariances from utils/linfit_plot.pro

Add ability to return covariances from utils/linfit_plot.pro.  This requires
a pirated version of LADFIT from the IDL library (utils/ladfit2.pro) that
computes the covariance on the initial least-squares fit for return.  Minor
coding neuroses addressed in utils/linfit2.pro.

	new file:   utils/ladfit2.pro
	modified:   utils/linfit2.pro
	modified:   utils/linfit_plot.pro
Add new utility routine for assigning colors to individual points

Add utils/colors_from_values.pro, which converts an input array into an
integer array with bounds [0,255] for plotting using a color table.

	new file:   utils/colors_from_values.pro
Merge branch 'master' into release
Set of documentation improvements.

	modified:   README.md
	modified:   emaf/README
	modified:   utils/README
	deleted:    utils/README_astrolib
More documentation updates.

	modified:   rot_curve/README
Merge branch 'master' into release
Check for IDL version >= 8.0

Add check for "recent" version of IDL, since some aspects of the code rely on
constructs introduced in or after this version.  Version 8.0 has been around
long enough (July 2010) that its requirement should not be a burden on those
wanting to use the distance-omnibus code base.

Check routine added, and modifications done to "front-line" routines to call
the check routine.  If an earler version of IDL is detected, execution halts.

	new file:   subroutines/omni_check_version.pro

	modified:   distance_omnibus.pro
	modified:   create_local_files/omni_assoc_catalog.pro
	modified:   create_local_files/omni_glimpse_emaf.pro
	modified:   create_local_files/omni_glimpse_postage.pro
	modified:   create_local_files/omni_glimpse_starsub.pro
	modified:   create_local_files/omni_grs_spectra_local.pro
	modified:   create_local_files/omni_import_velocity.pro
	modified:   create_local_files/omni_survey_postage.pro
Convert storage of map information into lists (requires IDL 8.0+)

Convert storage of map information from individual named variables into lists
(requires IDL 8.0+) to avoid excessive use of the Execute() command and the
feeling of spaghetti code.

Also, for the SURVEY structure, tabulate the number of pixels in each source,
and the peak flux density pixel value.  These are to be used with the surface
mass density computations.

	modified:   create_local_files/omni_assoc_catalog.pro
Convert storage of map information into lists (requires IDL 8.0+)

Convert storage of map information from individual named variables into list
(requires IDL 8.0+) to avoid excessive use of the Execute() command and the
feeling of spaghetti code.

	modified:   create_local_files/omni_import_velocity.pro
Convert storage of map information into lists (requires IDL 8.0+)

Convert storage of map information from individual named variables into list
(requires IDL 8.0+) to avoid excessive use of the Execute() command and the
feeling of spaghetti code.

	modified:   create_local_files/omni_assoc_catalog.pro
	modified:   create_local_files/omni_survey_postage.pro
Merge branch 'master' into release
Merge pull request #8 from tbowers7/release

V0.9.4 release branch