issue 137 - fix RI bits decoding
RI bits are present only in some transmission modes. For aperiodic reporting (the mode we do as of today), 36.213 7.2.1 (release 10) says: "RI is only reported for transmission modes 3 and 4, as well as transmission modes 8 and 9 with PMI/RI reporting" This commit activates decoding of RI bits only for transmission modes 3 and 4. 8 and 9 are not done today (as far as I know).
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