DOCUMENTATION

SYNOPSIS

 PROGRAM NAME: iVA 
 AUTHOR: Juan Lorenzo
 DATE:  April 2 2009 
        October 2014
        July 	2015 updated to oop
        August 	2015 introduced Tk widgets
        August 	16 made all event-driven
		Aug 18 	2016 made configuration files simple

 DESCRIPTION: Interactively test NMO in data
 Verstion 2.0 MainWIndow in subroutine 
              leads to multiple segementation faults
              when MainWindow is destroyed > 1
 Version: 2.1 is fully event driven

USE

NOTES

Examples

SEISMIC UNIX NOTES =head4 CHANGES and their DATES

STEPS

1.  use the local library of the user
1.1 bring is user variables from a local file
2.  create instances of the needed subroutines

Import

packages

instantiate methods

Declare variables

in local memory space

Check

for old data

Create Main Window

and start event-driven loop
Interaction with user
initialize values
If picks are new, show
message to user on how to pick data
 -Based on semblance,
     decide whether to PICK or move on to NEXT CDP
  -radio_buttons stop flow
  Must be AFTR semblance

set the prompt value according
to which button is pressed
then exit the MainLoop
destroy the main window after the prompt
is properly set

A callback to:
send cdp number to $iVA
delete output of previous semblance
plus more callbacks following...

      -PRESS the CALC button
      -Increment number of tries to make
         semblance display interact and show old picks
         (number_of_tries >1)
		-radio_buttons stop flow
           Must be AFTR semblance
           B4  iWrite_All_iva_out

In this case the $variable is empty
1. increment cdp
   Exit if beyond last cdp 
2. reset prompt
3. Otherwise display the first sembance
4 ... see following callbacks

saying goodbye 
clear old images
kill window
stop script

return which prompt has been set