Package manager - deprecating methods, require and versions

[Jon Smirl <jonsmirl@...>]

Does the new packaging system support multiple versions installed
simultaneously?
Something like:
require(copas) - latest version
require(copas, version=2.1) specific version

Can methods be marked deprecated in later versions? Use of these
methods should print a warning on their first use.

--
Jon Smirl
jonsmirl@gmail.com