Cut cell text after 12 letters

```
What steps will reproduce the problem?
1. I read the line with $data->val($k,'B',$sheet=1)
2. Will give this output: CDAX-GESAMTI
3. Cellcontent is: CDAX-GESAMTINDEX (KURS)
4. Cell format: Standard, Linebreak

What is the expected output? What do you see instead?
CDAX-GESAMTI

Please provide any additional information below.
latest version of reader,
Cellcontent is: CDAX-GESAMTINDEX (KURS)
Cell format: Standard, Linebreak
```

Original issue reported on code.google.com by `zimm...@gmail.com` on 31 Dec 2013 at 8:40

Start at the $data->eval($k,'B',$sheet=1) call described in the report and reproduce the cell-reading case with the provided content. Verify that the complete value, including text after the twelfth letter, is returned; the issue is done when the cell no longer loses the remaining text.

Written by the indexing model from the issue text.