#8 Resolve "Invalid variable name" issues

[Robert James Clay]

pylint has found found five instances of Invalid variable name issues.

• C: 64, 8: Invalid variable name "o" (invalid-name)
• C: 64,11: Invalid variable name "a" (invalid-name)
• C: 95, 8: Invalid variable name "s" (invalid-name)
• C: 96,22: Invalid variable name "e" (invalid-name)
• C:108,22: Invalid variable name "e" (invalid-name)

The first two may be resolved after the script is rewritten to use argparse since their current useage is in the current argopt code, but the other three may need more investigation if they are still present after the rewrite for python v3.
.