configuration editor capabilities

[tiagocoutinho]

It would be great if you could add supervisor configuration capabilities on the web.
There are some safety issues with this one. Still I think it would be nice if they are solved (probably involves implementing #8)

Features

• WEB / CLI forms to:
  • add, modify or remove process
  • add, modify or remove groups
  • add, modify or remove event listeners
  • change supervisor parameters
  • register add/remove/modify supervisor in multivisor
• low level configuration editor: edit .conf files directly (both multivisor and supervisor)

Problems to solve

• safety issues
• how to prevent user from writing wrong configuration files
• only enable edition if user that starts supervisor and multivisor has write permissions to its own configuration files?