new files: epochhdf5.py + h5example.py

created epochhdf5 reader. not tried yet.
created h5example.py not tried yet
changed in datareader __init__.py
postpic.datareader.chooseCode()   added:

elif code in ['hdf5', 'HDF5', 'h5']:
from epochhdf5 import H5reader, Visitreader
setdumpreadercls(H5reader)
setsimreadercls(Visitreader)
minor changes

now code is at least semantically right