Merge pull request #54 from marc-hanheide/hydro-devel

Tested on Linda
Revert "Merge pull request #54 from marc-hanheide/hydro-devel"

This reverts commit 71e00ddcabb0ee9981d59033a2cb7b505db08ab9, reversing
changes made to 51742257dd76556f461efb567828a7d5108bec48. The changes result in
the /ptu/state topic being broken. Probably because of line 325 in
flir_pantilt_d46/src/ptu46_driver.cc.