Task #8161: tDelayAndBandPassKernel2: remove confusing and unused parset keys referring to test data in custom location

Task #8161: t_cpu_utils: add support for DRAGNET GPU hostnames (drg??), such that test will run and fail if config is inadequate

Task #8161: fix build warnings. Simplify FileStream skip(): it cannot return -1 on success, as it always returns an abs offset.

Task #8161: fix build on CentOS 7. Add variants.dop256 to build on CentOS 7 (my laptop atm). Equalize compiler variants file options. Add CMAKE_SHARED_LINKER_FLAGS to set linker flags for shared libs (CentOS 7 GCC ld keeps default on not opting out overlinking, but can be changed now as in my variants file). Patch out build breakage when using log4cxx .

Task #8161: misc changes to non-source/-hdr files, or comments-only. Also add some filetypes to svn config.

Task #5817: attempt to fix flicker of tRTmetadataToFile. Move timeout to .run file after JD already merged quick MAC timeouts for localhost onto the trunk. Test passes 10x while make -j 32 gnu_opt build runs.

Task #5817: Use blocking connect on localhost to prevent connection delays (reintegrated r31902 and r31903 from LOFAR-preRelease-2_11)

Task #8077: Fix in delay compensation: apply the delays to the right block (delays of block 0 were applied to block -1, etc)

Task #8078: Temporarily revert Cobalt back to casacore 1.7.0 (NOTE: postinstall still installs 2.0.1 only!)

Task #8029: new cmdline for qpid-enabled-ltacp: use java 1.7; specify classpath and lexar001 properties file (for lexar001-qpid-broker); give full hostname as arg which is used as queue name to talk to the ltacp server

Task #8029: fill in user/pass during build using environment variables, so we can actually deploy software that can connect with valid user/pass's