psibase command line interface

[swatanabe]

• I would expect --sign and --sender to be specified at the same scope because they are closely related.
• There's no coherent logic to which options must come before the subcommand and which options must come after the subcommand. I'd prefer to get rid of the order restrictions entirely and allow any option to appear anywhere. Failing that, all options should at least always be allowed after the subcommand (I believe that clap uses the attribute from_global to specify this behavior).
• Several options, (-k, -S, -i) are used by multiple subcommands. I'd like to hoist them to have a common definition.
• Instead of -i, I think it would be more intuitive to use -f/--force (which is the standard for overriding "helpful" restrictions) combined with either no -k or -k "" (an empty key)
• upload-tree doesn't need to be a separate command. It can be upload -r, upload --recursive, or just assumed to be recursive if the source is a directory.

[James-Mart]

Removed

The Content-Type for upload should be optional and should be deduced in the same way as upload tree

In favor of separate issue #390