Tarball installation more intelligent now (down. only unpacked archives). Changed documentation.
Tarball installation more intelligent now (down. only unpacked archives). Changed documentation.

andersbll/vlbenchmarks,CVML/vlbenchmarks,andersbll/vlbenchmarks,CVML/vlbenchmarks,vlfeat/vlbenchmarks,vlfeat/vlbenchmarks,andersbll/vlbenchmarks,CVML/vlbenchmarks,andersbll/vlbenchmarks,vlfeat/vlbenchmarks