Change RX sampling time to happen in the middle of the bit#1

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sd2k9 wants to merge 2 commits intopabennett:masterfrom

sd2k9:fix-rx-sample-in-middle-of-bit

Commits on Jun 30, 2013

* Rewrite of sampling clock generation to use only one set of counters,
sd2k9
committed

Commits on Jul 7, 2013

Added waveform screenshots illustrating the wrong (before) and fixed (now) behaviour
sd2k9
committed