Move cell-link to link folder, inherit from LinkDelay.
Remove average rate estimator, since SFD already does this.
Remove CellLink's proportionally fair scheduler; this is SFD's responsbility.
Setup proper inheritance structure for Tcl mirror of CellLink.
Remove anything related to slot durations, that's too detailed for us.
Replace constructor arguments with calls to bind().
Move cdma-rates.h to the "link" folder.
Modify comments now that we aren't doing slot wise scheduling.
SFD now inherits from LinkAwareQueue. Fix static_cast later.
Add multi-user Cellular Link to cellsim.
Tick once at the beginning to populate _current_rates.
Add Tcl cmd interface for CellLink, seems to pass sanity checks.
Get rid of ugly static_cast, use a safer method of attaching link to queue.