Implement read / write table

[soniamitchell]

[soniamitchell]

It doesn't seem possible to write a compound table (DataFrame?) to an hdf5 file in Julia.

[soniamitchell]

@richardreeve could use some help with this one

[richardreeve]

Cool. It'll be a couple of days before I have time to look at it I'm afraid, but I'll look into it asap.

[soniamitchell]

No rush - just wondered if you knew the answer. I’ll ask around if you’re too busy..!