Hpim-dm

Installation instructions using pip
Include version command

This version introduces minimal fixes:
- README includes absolut link to docs (on PyPi page the relative link didn't work properly);
- force running HPIM-DM as root

Implemented Hold Forwarding State:
- Allow an AW that loses an Assert to hold its forwarding state for a period of time. In this way it is possible to minimize loss of data packets during the replacement of the AW. However this introduces possible duplications while the previous AW is holding its forwarding state.
- It is possible for the user to configure this setting (with -hfs option).

This version has all code inside `hpimdm` package. This allows the user to have pim-dm and hpim-dm software installed simultaneously without any conflict (previously same named python modules were used in both implementations causing conflicts).
While this allows the user to have both pim-dm and hpim-dm (and other Python modules that have the same name as ours) installed, however the user cannot have both protocols running at the same time!

Includes dissertation work and security implementation.