Add -c, -i, --no-quiet, and docuent them.
Switch from argparse to configargparse and allow config files, see issue [#6].
Use pickle protocol compatible with py2 and py3.
Document use of package name globs; fix two minor errors.
Allow use of installed package names with globs instead of portnames, see issue #5.
Minor: adjust indentations.
Migrate from deprecated optparse module to argparse.
Delete an unused option and a related function.
Update port, delete generated file.
Rework command line options.
