add new action: init which combines --install and --store

[samirnoman]

when we add git-store-meta for the first time to a git repo, we have to issue two seperate commands:

perl git-store-meta.pl --install # this isntalls the hooks but not .git_store_meta
perl git-store # this creates .git_store_meta

If we only install the hooks, the .git_store_meta is not created automatically. Without the file .git_store_meta, the hooks will not do anything.

This might confuse new users, because they may assume that installing the hooks is enough.

There are a few solutions to this:

1. we can add a new option (such as '--create_store') which will work with --install action
2. we can make creation of the .git_store_meta automatic with --install (if it does not exist of course) and add (--no-store) if we don't this to happen
3. add a new action (--init) which will run --install and then --store actions together

I have made a modification to implement the third alternative (add action --init) because I think it's meaning is more intuitive to git users.

TODO: I think it might be a good idea to check if .git_store_meta already exist before overwriting it with --init action; unless --force is in effect (or use another option for that)

[samirnoman]

After thinking more about it, I think it might be helpful to also add .git_store_meta and commit it the repo using the action --init (need to check that the work-tree is clean).
So, the command perl git-store-meta.pl --init should be equivalent to these:

perl git-store-meta.pl --install
perl git-store-meta.pl --store
git add .git_store_meta
git commit -m 'add .git_store_meta'

I recommend checking if the work tree is clean before executing it, similar to the checks in apply.

I think this is what most users should expect when using --init .

[danny0838]

As --install is mostly a one-time command for a repo, and --install and --store don't share same options, we don't plan to implementation something like this that further complicates the code and documentation.

[samirnoman]

fixed eol