replace all h5::[.] calls with readDataset(openDataset(.))

[mkoohafkan]

waaaaaay faster

[mkoohafkan]

implemented WOW

[mkoohafkan]

Possible memory leak; I didn't add any code to close groups, e.g. h5close(dataset.object)

need to add a function like this:

get_dataset = function(x, path, type){
  g = openDataSet(x, path, type)
  on.exit(h5close(g))
  readDataset(g)
}