Revert "Try no NERDTree."

This reverts commit f18cad0c1bfbbe571d3276071d57b883de5bdfe4.
Revert "Improve netrw usage."

This reverts commit 1b03dfc62f97343b98206159e7f4f089686d687e.
Revert "Hide dot files in netrw."

This reverts commit b411756c5fcd85c24505697abd4a692a685493ec.