Flake8 + python 3 fixes to IBLLeakageCurrentData scripts

Typically changes

bloop = open(saveFileName,'r')	
for bloopLine in bloop:
   saveFile.write(bloopLine)			
bloop.close()

with

with open(saveFileName,'r') as bloop:
   for bloopLine in bloop:
      saveFile.write(bloopLine)

Also remove unused variables + fix mixed usage tabs+indentations