adds qutest.py failure line number

[harrisonmg]

This PR adds functionality to the qutest.py script.

Upon failure of a QUTest, the line number of the calling DSL function from the user's test script will be printed as shown below.

Ex: The line number in test_init.py of the failing expect() call is 13.

QUTest unit testing front-end 6.4.0 running on Python 3.6.7
Copyright (c) 2005-2018 Quantum Leaps, www.state-machine.com
Attaching to QSPY (localhost:7701) ... OK
--------------------------------------------------
Group: test_init.py
init: FAIL (1.443s):13
  expected: "=FAILURE=> St-Init  Obj=ExAO,State=NULL->ExAO_idle"
  received: "===RTC===> St-Init  Obj=ExAO,State=NULL->ExAO_idle"
============= Target: 190326_084346 ==============
1 Groups, 1 Tests, 1 Failures, 0 Skipped (1.456s)
FAIL!

[quantum-leaps]

Hi Harrison,
Thanks a lot for the valuable contribution.
Your change with a slight modification has been incorporated into the qutest.py script.
I made a new commit of QTools labeled as 6.5.0, so you can pick it up from there.

Here is a qutest output example from a test run (please note the FAIL lines):

python C:\qp\qtools/qspy/py/qutest.py *.py build/test_basic.exe
QUTest unit testing front-end 6.5.0 running on Python 2.7.15
Copyright (c) 2005-2019 Quantum Leaps, www.state-machine.com
Attaching to QSPY (localhost:7701) ... OK
--------------------------------------------------
Group: test_ProductionCode.py
FindFunction_WhichIsBroken() Should Return Zero If Item Is Not In List, Which Works Even In Our Broken Code: PASS (0.154s)
FindFunction_WhichIsBroken() Should Return The Index For Items In List, Which Will Fail Because Our Function Under Test Is Broken: FAIL @line:32 (1.104s):
   expected: "0000000001 USER+000 FindFunction_WhichIsBroken 1 34"
   received: "0000000001 USER+000 FindFunction_WhichIsBroken 0 34"
 FunctionWhichReturnsLocalVariable() Should Return The Current Counter Value: PASS (1.133s)
 
 FunctionWhichReturnsLocalVariable() Should Return The Current Counter Value Again: PASS (0 .069s)
 FunctionWhichReturnsLocalVariable() Should Return Current Counter, But Fails Because This Test Is Actually Flawed: FAIL @line:61 (0.053s):
   expected: "0000000001 USER+001 FunctionWhichReturnsLocalVariable 0x1234"
   received: "0000000001 USER+001 FunctionWhichReturnsLocalVariable 0x5A5A"
 ============= Target: 190328_165854 ==============
 1 Groups, 5 Tests, 2 Failures, 0 Skipped (3.565s)
 FAIL!
 Makefile:224: recipe for target 'run' failed
 make: *** [run] Error 2 

--MMS