Fix scroll position when invoking reader on a block.

The problem was that the block is not folderish and therefore was not added in the
URL automatically.
The fix is to use the base-url from the <base> tag.
Merge pull request #72 from 4teamwork/jone-fix-reader-at-block

Fix scroll position when invoking reader on a block.
Index: umlaut sorting support by quoting umlauts.

Requries https://github.com/4teamwork/ftw.pdfgenerator/pull/36