Re: [PATCH v2] scalar: accept -C and -c options before the subcommand

> From: Johannes Schindelin <johannes.schindelin@gmx.de>
> 
> The `git` executable has these two very useful options:
> 
> -C <directory>:
> 	switch to the specified directory before performing any actions
> 
> -c <key>=<value>:
> 	temporarily configure this setting for the duration of the
> 	specified scalar subcommand
> 
> With this commit, we teach the `scalar` executable the same trick.
> 
> Note: It might look like a good idea to try to reuse the
> `handle_options()` function in `git.c` instead of replicating only the
> `-c`/`-C` part. However, that function is not only not in `libgit.a`, it
> is also intricately entangled with the rest of the code in `git.c` that
> is necessary e.g. to handle `--paginate`. Besides, no other option
> handled by that `handle_options()` function is relevant to Scalar,
> therefore the cost of refactoring vastly would outweigh the benefit.