core: fixing up complex_to_xxx for using Volk where appropriate. Speed benchmark were used to decide which implementation to use.
core: complex_to_xxx (float, real, imag, arg) to volk.
core: minor edits.
core: switched complex to mag and mag_squared to use Volk functions.
core: update Makefile.am for new type converters.
core: more type converters in Volk; adding char_to_short converter.
core: more conversion work to Volk for type converters.
core: QA codes for float_to_X and short_to_X (note: float_to_int needs work).
core: cleanup short_to_float.
core: short_to_X: adding short_to_char block using Volk; made Volk version of short_to_float.
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