Links for URLs are missing the last character

```
What steps will reproduce the problem?
1. Create a spreadsheet in which the cell is a URL, http://foo.bar.com/one/two
2. Run php-excel-reader

What is the expected output? What do you see instead?
In the HTML, the URL displays properly, but it links to
http://foo.bar.com/one/tw (notice the last letter is missing)

Please provide any additional information below.
My guess is function _encodeUTF16() is at fault.
```

Original issue reported on code.google.com by `d...@cimpress.com` on 9 Jul 2010 at 4:41

Reproduce the issue with a spreadsheet cell containing http://foo.bar.com/one/two and inspect the generated HTML link. Start by reading _encodeUTF16(), which the report identifies as a possible source of the truncation. Done means the displayed URL and its link target both retain the final character.

Written by the indexing model from the issue text.