change dalesdata/dalesdata.py

[bramiozo]

Replace

import dalesreader
import dataslice  

by

import dalesdata.dalesreader as as dalesreader
import dalesdata.dataslice  as as dataslice

:)

[bramiozo]

ditto in dalesview/dalesview.py

import mpl4dales 

should be

import dalesview.mpl4dales as mpl4dales