GEOS-ESM/mepo: Multiple Enhancements and Fixes

This release of mepo has many enhancements.

Updates Mepo Styles

With this PR, one can do:

mepo init --style <foo>

or:

mepo clone --style <foo> URL

and the --style <foo> can be one of naked, prefix, and postfix with the default as prefix as that is the current dominant style.

These styles are prefix leads to @subrepo, postfix leads to subrepo@, and naked leads to subrepo when mepo clones the subrepos

Mepo Config

Add support for a ~/.mepoconfig file and adds a new command:

usage: mepo config [-h] {get,set,delete,print} ...

Runs config commands.

positional arguments:
  {get,set,delete,print}

which has four subcommands. I tried to make it like git-config in many respects, but I'm not that good at Python and Argparse so it's like many other mepo commands with subcommands.

NOTE: This capability is not as powerful as git-config is. For example, this:

[alias]
ci = commit

is allowed. But this:

[alias]
cm = commit -m

is not. This is a limitation of what I could do in Python and with Argparse. You can make an alias of a command, but not any of the options of commands. And I couldn't figure out how to do aliases with subcommands.

For "style" (see above) the entry would be:

[init]
style = postfix

It's in the [init] section because technically that is where the command is used. It's just that mepo clone "piggybacks" on init so that if you do:

mepo clone --style naked

it's actually doing:

mepo init --style naked
mepo clone

Examples mepo config print

To print the .mepoconfig file:

mepo config print

mepo config set

To set a value in the .mepoconfig file:

mepo set alias.st status

In "gitconfig" style, this is equivalent to adding to the file:

[alias]
st = status

mepo config get

This command gets section.option:

❯ mepo config get alias.st

    [alias]
    st = status

mepo config delete

This command deletes the section.option from the file

Tagging Updates

Allow mepo tag create and mepo tag delete to work on all components if none are passed in.

Push-All

Created mepo push-all to so one can do mepo push-all --tags to push tags on all repos

Fixes Status and Compare Weirdness

This update uses git rev-list to try and see if two tags are the same. This can then be used in status and compare so that just in case mepo is seeing different tags, we can check if they point to the same commit. If they do, then we just "re-use" the original tag that mepo clone used.