Merge pull request #184 from jsliang/master

Do not exit with error if current directory is the only match.

Closes #182.
version bump to 21.4.6
minor docs update regarding compinit
remove mailing list link since it's unused
adding option to decrease weight

added a new option, -d/--decrease to decrease the weight of a path.
added --increase as an alias to --add for symetry.
v21.5.0: add --increase and --decrease options to manually change weight.
fix some pep 8 issues
fix unit tests to match new decrease calculation
Show database file when printing stats.

Closes #188.
normalize path ending before adding to the DB
Merge pull request #193 from svent/normalize_paths

normalize path ending before adding to the DB