dot_idl_files.txt = .idl_* files used by LIBR

  LIBR (and perhaps other routines) pick up some needed information
  from a number of files in your home directory.  The names of these
  files all start with .idl_.  This method of passing custom information
  to IDL has several advantages over using system variables.  One important
  one is that more complex information is easy to handle since it is stored
  in files.

  All the .idl_* files allow optional comment lines.  Comment lines have
  ; in the first column and are ignored.  Null lines are also ignored.

  The files needed and their functions are:

  .idl_editor	gives the name of your preferred text editor.
  .idl_libs	gives a list of main and optional mirror libraries.
  .idl_id	helps LIBR find your name or initials when building
		a standard IDL front end template.

  More details on each file are given below.

  .idl_editor:  An example file is:
;------  Editor to use from IDL spawn  --------
;       R. Sterner, 15 Jan, 1993
vi

  .idl_libs:  Each non-comment line of the file has one or two items.
     First is a main library directory.
     Second is an optional mirror library directory.
     The two libraries are separated by tabs or spaces.
     Every update to a main library is also done to a mirror library
       if one is given.
     As many main libraries may be given in the file as desired.  All,
     some, or none may have mirror libraries.
     A directory named trash is assumed to exist.  Deleted routines are
     copied to this trash directory.  It should be listed in .idl_libs.
     Clean out the trash directory occasionally.
  An example file is:
;-------------  Library list  --------------------
;------ Main library ------     ------  Mirror library  --------
/data_bases/idl_libs/idlusr     /users/sterner/idl/mirror/idlusr
/data_bases/idl_libs/idlusr2    /users/sterner/idl/mirror/idlusr2
/data_bases/idl_libs/idlspec    /users/sterner/idl/mirror/idlspec
/data_bases/idl_libs/trash      /users/sterner/idl/mirror/trash

  .idl_id:  Has 4 non-comment lines giving the routine author's ID:
last_name
first initial
first_name
initials
  When constructing or updating the standard IDL frontend an attempt is made
  to find a line in the routine containing the author's name (or initials)
  the date the routine was written.  An example of such a line is:
;-------  R. Sterner,  21 Jan, 1993
  An example file is:
;------  .idl_id = User ID used by getmodhist
sterner
r
ray
res