0.1.2
 - implement SeriesData.saveh5 (export as qpimage.QPSeries) (#2)
 - add unique part of file name to SeriesFolder image identifiers (#2)
 - change API for SingleData ("idx=0" for user convenience)
 - extract identifiers from hdf5 files
0.1.1
 - support pathlib on high level
 - add SeriesData.identifier
0.1.0
 - initial release
