DFReader: add support for float16 in BIN files

[peterbarker]

1970-01-01 10:00:04.00: FMT {Type : 128, Length : 89, Name : FMT, Format : BBnNZ, Columns : Type,Length,Name,Format,Columns}
1970-01-01 10:00:04.00: FMT {Type : 115, Length : 44, Name : FMTU, Format : QBNN, Columns : TimeUS,FmtType,UnitIds,MultIds}
1970-01-01 10:00:04.00: FMTU {TimeUS : 4009682, FmtType : 115, UnitIds : s---, MultIds : F---}
1970-01-01 10:00:04.00: FMTU {TimeUS : 4009680, FmtType : 128, UnitIds : -b---, MultIds : -----}
1970-01-01 10:00:04.00: FMT {Type : 59, Length : 75, Name : MSG, Format : QZ, Columns : TimeUS,Message}
1970-01-01 10:00:04.00: FMTU {TimeUS : 4009684, FmtType : 59, UnitIds : s-, MultIds : F-}
1970-01-01 10:00:04.00: MSG {TimeUS : 4009556, Message : Start 2}
1970-01-01 10:00:04.00: FMT {Type : 254, Length : 15, Name : TYPn, Format : Qn, Columns : TimeUS,Str}
1970-01-01 10:00:04.00: FMTU {TimeUS : 4009689, FmtType : 254, UnitIds : s?, MultIds : F?}
1970-01-01 10:00:04.00: TYPn {TimeUS : 4009684, Str : ABCD}
1970-01-01 10:00:04.00: FMT {Type : 253, Length : 75, Name : TYPa, Format : Qa, Columns : TimeUS,Arr}
1970-01-01 10:00:04.00: FMTU {TimeUS : 4009692, FmtType : 253, UnitIds : s?, MultIds : F?}
1970-01-01 10:00:04.00: TYPa {TimeUS : 4009690, Arr : array('h', [-32768, 32767, 1, -1, 0, 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])}
1970-01-01 10:00:04.00: FMT {Type : 252, Length : 185, Name : TYP3, Format : QabBhHiIfdnNZ, Columns : TimeUS,b,B,h,H,i,I,f,d,n,N,Z}
1970-01-01 10:00:04.00: FMTU {TimeUS : 4009696, FmtType : 252, UnitIds : s????????????, MultIds : F????????????}
1970-01-01 10:00:04.00: TYP3 {TimeUS : 4009693, b : array('h', [-32768, 32767, 1, -1, 0, 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]), B : -17, h : 42, H : -12372, i : 19812, I : -98234729, f : 74627293, d : 35.87654113769531, n : 67.73932647705078, N : ABCD, Z : ABCDEFGHIJKLMNOP}
1970-01-01 10:00:04.00: FMT {Type : 251, Length : 46, Name : TYP4, Format : QcCeELMqQg, Columns : TimeUS,c,C,e,E,L,M,q,Q,g}
1970-01-01 10:00:26.48: FMTU {TimeUS : 26485672, FmtType : 251, UnitIds : s?????????, MultIds : F?????????}
1970-01-01 10:00:04.00: TYP4 {TimeUS : 4009697, c : -98.23, C : 54.36, e : -92092.38, E : 192398.72, L : -0.3576543, M : 5, q : -98239832498328, Q : 3432345232233432, g : 13.5390625}
1970-01-01 10:00:04.00: FMT {Type : 250, Length : 27, Name : NANS, Format : fdfd, Columns : f,d,bf,bd}
1970-01-01 10:00:26.48: FMTU {TimeUS : 26485676, FmtType : 250, UnitIds : ????, MultIds : ????}
1970-01-01 10:00:26.48: NANS {f : qnan, d : qnan, bf : nan, bd : nan}