Handle the disallow-trailing-tuple chck more sanely by verifying non-terminating newlines. Close #1424

We were using editdistance, which is super fast, but the downside is that
it might require a compiler on some envs in order to be installed. As such,
it is also a hindrance not just for these kind of envs, but for PyPy as well,
since it is written in C. Let's use a handcraft implementation
for now.
Close #1423

Exceptions have a different type since astroid 1.5.0, use a visit_exceptioninstance method for them. Close #1419

This is controlled through the new flag ``--ignore-on-opaque-inference``, which is by
default True. The inference can return  multiple potential results while
evaluating a Python object, but some branches might not be evaluated, which
results in partial inference. In that case, it might be useful to still emit
no-member and other checks for the rest of the inferred objects.

Don't emit missing-final-newline or trailing-whitespace for formfeeds.

Keep the builtin str.splitlines but check for the superset characters and recombine them later.
Close #1218.
Close #1219

Add a new warning, assign-to-new-keyword.

This warning is emitted whenever we detect an assignment to a
variable name that will become a keyword in the future.

https://docs.python.org/3/whatsnew/3.6.html#deprecated-python-behavior

Closes #1389

Closes #1399

- Use correct capitalisation of PyCQA organisation in Github links
- Use current version number (1.7) in ChangeLog file
- Use readhedocs URL instead of outdated docs.pylint.org
- Avoid here in links in favor of actual info on link we're pointing to

Fixes #1383

This PR fixes an issue for users of macOS, where by default LC_CTYPE
is set to an invalid locale. See https://bugs.python.org/issue18378
further discussion on this issue.

Add 2 different error codes for different params defined
Split param name checking in two functions, one for missing checks
and another for different names checks
Check for missing params and then check for differing params
Minor fix in type of found_argument_names [list --> set]
Fixes #1342

VS documentation has a dedicated page for its PyLint integration; also removing obsolete references to VS 2003.

Fixes #59

This change should speed up Pylint a bit.

Will fix #1295