Automatically detect user module in the same subfolder of the current script

[fireattack]

Currently LS only searches the root for the user module unless you manually add paths to python.autoComplete.extraPaths.

But when editing a file, say, sub/script.py with content like

from module import myfunc

LS should automatically search for modules in folder sub/ (sub/module.py in this case) without manual setting, because Python will always search modules in the directory containing the input script.

Currently it will throw an "unresolved import" warning despite the script can run just fine.

[jakebailey]

Duplicate of #1602.