Metadata from multifast5

[usamec]

From single Fast5 (whether read or file), I can do following:
read.status.read_info[0].start_time
read.status.read_info[0].read_number
read.status.channel

Unfortunatelly, this is missing from multifast5 and has to be recovered from read.handle.....
It would be nice to have the interface unified.

[fbrennen]

Thanks for the suggestion @usamec -- we'll look at adding that.