This reverts merge request !351

- added property flags
- added property flagsRaw
- added property data
- added property dataRaw
- added property result
- added Result class
- rm Accessors
- fixed test that rely on getResult

- fixed copy-tests
- fixed deepcopy attrs in dios

function calls. Instead of copying the entire dios, we now only
store the values we actually masked and their `iloc`-position.
This has the same worst-case-costs (i.e. all values are subject
to masking) but results in significantly cheaper average costs
(i.e. only a small subset of values are subject to masking)