Add --co alias for --config-override

[micahellison]

Feature Request

It would be nice to use --config-override with a shorter alias.

Use Case/Motivation

When --config-override was implemented, I started using --co for it. Our CLI parser automatically matches up abbreviated arguments like this with their longer endings... unless it's ambiguous, which it is in the current beta release because of --config-file:

jrnl --co
usage: jrnl [--debug] [--help] [--version] [--list] [--encrypt] [--decrypt] [--import] [-on DATE] [-today-in-history] [-month DATE]
            [-day DATE] [-year DATE] [-from DATE] [-to DATE] [-contains TEXT] [-and] [-starred] [-n [NUMBER]] [-not [TAG]] [--edit]
            [--delete] [--format TYPE] [--tags] [--short] [--config-override CONFIG_KV_PAIR CONFIG_KV_PAIR]
            [--config-file CONFIG_FILE_PATH]
            [[...]]
jrnl: error: ambiguous option: --co could match --config-override, --config-file

It would be nice to specify this clearly. The new --config-file argument already has a --cf alias defined, so --co is very consistent. It also doesn't interfere with -contains since that argument has only one hyphen.

Example Usage

View latest 999 entries with a different timeformat than usual:

jrnl --co timeformat '%c' -999

Other information