ReadWriter functions only work after require(ReadWriter)

**Description**

- require(ReadWriter) loads the dependee `Stringendo`. 
- This may be a structural problem across repos. Investigated in vertesy/pipatorium#5

**Expected  and Buggy Behavior**

```r
# Does not work
> ReadWriter::write.simple(xxx)
'Error in kollapse(...) : could not find function "kollapse"'

# Works (it reproduces #8 )
require(ReadWriter)
write.simple(xxx)

```
