Data type for ADC with more than 16-bits

[jamesoncollins]

This is a feature request for the iio device source block.

For ADCs with more then 16-bits of data there is currently no standard way, that I know of, to convert the output from gr-iio.

Possible options:

• include an option to convert all outputs to float to avoid this problem and be agnostic to the underlying device
• include blocks for performing the require typecast
• include an option to specify the output type manually, which requires advanced knowledge of the underlying device