Ticket #304 (enhancement)

gr.skiphead internally uses the type "long long". But the size parameter has type size_t, that is normally "int". This is inconvenient.

For simulations, it is advantageous to specifiy a very large window. E.g. the fastest way to qualify your demapper BER performance is to average over the bit errors (use a gnuradio block). Use an average window of size 1e8, and skip the first 1e8 - 1 values. With a subsequent gr.limit( .. 1), you retrieve the last estimate. That way, the vector sink doesn't consume up your memory.