Verify linting with PTVS analysis active

[MikhailArkhipov]

PTVS analyzer provides syntax error squiggles. It does not, however, provide extensive linting as, say, pylint. We need to verify linters work as expected with PTVS active.

[DonJayamanne]

Thus we need to run pylint with certain messages suppressed in order to avoid duplicate error reports.

Should we bother. If we are, then we'll need to do this for All linters.

[MikhailArkhipov]

Maybe not. We can just leave code as it is so it lints on save, if enabled. If there are syntax errors, one would get duplicates but so would happen if multiple linters are on. If there are no syntax errors, then only lint messages will appear.

I changed title to 'verify linters work with PTVS active'