Add link options to the python radio link

[ataffanel]

The cpp link has introduce link options that makes the link behavior explicit instead of implicit. This includes enabling safelink and various packet filters (the three added parameters appended to an URI are "?safelink=0&autoping=0&ackfilter=0")

There options should be implemented in the python radio link so that we can avoid hacks and special case in other parts of the code (see PR #215).

[knmcguire]

Should be part of the comstack discussions