DataArrayHDF5: handle count == {} when reading
Hydra: handle resize for scalar values correctly
TestDataArray: test for reading of scalar values
Merge pull request #397 from gicmo/issue_396

Fix reading of scalar values
Group: add findByNameOrAttribute method
[test] Group: add test for findByNameOrAttribute
Group::findByNameOrAttribute: add doxygen docu
Group: small cleanup: use make_optional
Group: findByNameOrAttribute -> findGroupByName..
Group: findGroupByNameOrAttribute: swap params

To be consistant with the other FindXByY functions
File+FileHDF5+tests: getBlock support for name&id
Block+H5+test: getDataArray: support for name+id
Merge pull request #399 from gicmo/nameOrId

Initial support for opening entities by name or id
[Hydra] improved checks for 1-D vector size
Merge pull request #400 from jgrewe/hydra_vector

Handle 1-d selection of n-data in Hydra for std::vector args
DataArray: add appendData method

This function implements the same logic as the append
method of the DataSet objec tin nixpy.
[test] add checks for DataArray::appendData
Merge pull request #404 from gicmo/appendData

Support appending of data to a DataArray
LGTM, thanks
Extract the IO function from DataArray into DataIO
DataIO: remove [get|set]DataDirect interface

and also make [get|set]Data as non-virtual functions