Header reference generated by Doxygen has full paths of headers

Hey,

In our external project (HPX - https://github.com/STEllAR-GROUP/hpx) we use
the Boost documentation toolchain to generate docs which works very well. We
recently updated to the newest version of the Boostbook style sheets and
were surprised to see that now the header filenames in the doxygen generated
docs are referenced using their full name (path!) (for an example see:
http://stellar-group.github.io/hpx/docs/html/index/s06.html). This is not
desirable as it exposes private file directories in public docs. 

Was there any rationale to change the previous behavior or is this an
oversight.

Any help would be much appreciated!
Regards Hartmut
---------------
http://boost-spirit.com
http://stellar.cct.lsu.edu