This is needed to handle compound filetypes since we cant imply the
location of the syntax checker file from the filetype.
e.g. we want to load `syntax_checkers/python/pylint.vim`, but the
filetype is `python.django`. Previously this was causing `runtime
syntax_checkers/python.django/pylint.vim` to be executed.
The parameter `g:syntastic_python_checker_args` can be used to pass additional
arguments to the Python syntax checker. Example configuration:
let g:syntastic_python_checker = "flake8"
let g:syntastic_python_checker_args = "--ignore=E501 --max-complexity=10"
Define a user-configurable variable g:syntastic_python_checker and
otherwise default to an available checker.
Make the highlighting catch all pyflakes errors
Add a header to the file
Make the errorformat handle columns provided by pep8 through flake8
