crt_series initialisation changed

The current model does not allow running any command outside a GIT tree.
Even 'help' fails. The simple hack is to use setattr to initialise
crt_series in a module. The other option would be to initialise it in
every command file but I'm too lazy to do it.

Signed-off-by: Catalin Marinas <catalin.marinas@gmail.com>