Add dynamic version of next/prev power of 2 and unit tests
Added macro and metafunction to retrieve SIMD register file size
Add test for static extract
Small clean-up on bitwise_and
[#185] Add a register_count macro and metafunction

Provide informations on the number of available register in scalar
and simd mode for any given types.
Missing dynamic specification for rng_settings
Some more doc structure for Boost.SIMD
Fix defining prev/next power of 2
oneplus, like oneminus, use saturated operations instead of replicating code
fast_rec include errors
Fix is_equal checks for common case
Fix is_not_equal common case check and add integral common case
Factorize relationship between bitwise_andnot and bitwise_notand
first oxygenation pass of predicates
suppressing spurious ifdef in predicates
polishing scalar predicates units
polishing simd predicates units
polishing predicates scalar benches
polishing predicates simd benches
oxygenation of ieee