Bug#852625: unrar-free is useless and should be removed

[Adrian Bunk]

Package: unrar-free
Version: 1:0.0.1+cvs20140707-1
Severity: serious
Tags: stretch sid

unrar-free itself supports only ancient versions of the RAR format,
and for any archives created with WinRAR during the past 15 years
all it does is to call unar.