Localalias

-------------------

Fixed:

* Using ``-x`` without arguments should fail explicitly

-------------------

Added:

* Global aliases (invoked with the ``--global`` option):

- Global aliases allow you to create default definitions for aliases that can be overridden on
a local basis.
- All action commands still work properly when ``--global`` is used but they operate on the global
database instead of the local one.

-------------------

Fixed:

* Dashed command-line arguments are not properly passed to command definition when an alias is
executed.

-------------------

Added:

* New "rename" action command (``-R`` option).
* New ``--version`` option.

Changed:

* Remodeled argument parsing strategy. This remodel is mostly internal. A few actual changes in the
API have taken place:

- Options take arguments now, so the alias name must follow the action command.
- The Show command no longer has an explicit option.
- Long options have been removed.

-------------------

Fixed:

* Automatic command-line arguments are word-splitting for single-line alias definitions without
param arguments.

-------------------

Fixed:

* Executed command's exit status not preserved (reintroduced this bug with v2.0.3).