Consolidate coverage options

 - Remove Makefile.coverage.in
 - Drop BUILD_COVERAGE_ON_DEBUG for ENABLE_COVERAGE_REPORT (defaults to
    on if included)
 - Add clean-gcda target

this is required for dcmctrl7 config

This fixes issues when using LaTeX in doxygen

Previous attempt to work around the tine linking issue did not work.

This is a work around for not finding libtinemt at runtime. The DOOCS serverlib is lacking the RPATH, hence its dependencies are not found. If clientlib is linked first, tine is already linked.

Search explicitly for libgul14 which is required by DOOCS libraries

- The test needed an adaptation in the dummy.
- No change to the library.
- Increased patch level

fixed using the included boost test version and at the same time linking the test libraries. Caused double free corruption