[evlatests] New bandpass tool feature

[Walter Brisken]

Hi all users of the EVLA bandpass tool,

The EVLA bandpass tool available from 
http://www.aoc.nrao.edu/~wbrisken/evla.html has a new trick.  It can plot 
bandpasses from the WIDAR deformatters.  Simply go to the bottom of the 
list of Antennas and you will see new entries of the form:  d001-t-1:01:A .
This cryptic code encodes three things: The deformatter device name, the 
EVLA antenna number (with a leading zero if < 10) and the IF name.  The 
antenna and IF are needed in conjunction with the deformatter name in 
order to determine the actual frequency range that the spectum represents. 
The "Which IF" selection will be ignored when you choose an "Antenna" that 
is actually a widar deformatter.

The program needs knowledge of which widar deformatters are connected to 
which EVLA antennas/IFs.  This is done through a text file:
/home/mchost/evla/data/widarFORMs
which currently contains:

d001-t-0:19:A
d001-t-1:01:A
d001-t-2:02:A
d001-t-3:03:A

exactly the same information as you see in the web form.  I have only 
populated this file with 4 such defomatters based on data from:

http://cmibhost.aoc.nrao.edu/

Someone (Michael???) will have to complete the population this file and 
keep it up to date as connectivity changes.

-W