Process management

[wavexx]

python.el's management of processes is too simplistic: You can either have a single global process, or a dedicated process per-buffer. Since you cannot select/associate buffers to processes, I always end up creating dedicated processes, but then have to resort to manual yanking into the process's buffer to evaluate code that I'm debugging in a library.

The simplest behavior I can think of to fix this is:

• add a basic function to generate a process/buffer tree [which can be used for selection]
• allow to change the associated process once a buffer is created (by reusing the above)
• modify the prompt to create a new process to: global process/dedicated process/select existing

[wavexx]

Session management: vspinu/sesman#1