hexToBits converts a string holding hexadecimal digits to a sequence of integers
0 or 1, for the bits.  This is mainly for for use within showQCTests().
hexToBits(hex)An integer vector holding the bits as values 0 or 1.  The
inverse of 'mathematical' order is used, as is the case for the base
R function rawToBits(); see the “Examples”.
library(argoFloats)
hexToBits("3") # 1 1 0 0
#> [1] 1 1 0 0
hexToBits("4000") # 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
#>  [1] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0