fix `archiveshub.__all__`
add `--version` option to base argument parser

The practical upshot is that any coomand or script that uses or
sub-classes BaseArgumentParser can be called with `--version` to
report the version of the `archiveshub` package that is installed
improve remove filter link in absence of sprite image
fix reload uWSGI apps when stores/indexes change
fix more encoding bugs in contributor collection lists
remove dates from management scripts

Fiddly to maintain - release date or git logs provide a more than
adequate substitute.
updated console search script
fix version number and build tag