remved the library without path from the _LIBRARIES. It is added with path by the config file anyway, which makes linking easiser because you don't need the link path variable.

Do not link against all boost libraries, since we must not link against the unit test library. The required libraries are already pulled in by the control system adapter anyway.

- update dependency versions

fixed another uncought exception when converting e.g. an Inf from double to float (was still occurring for D_spectrum)

Temporary roll-back to the periodic update polling instead of the readAny()-based update logic. This is necessary, since the readAny() implementation seems to be too slow for bigger servers like the LLRF server. A proper solution should be found to improve the performance of readAny() for larger number of variables.

adding the current path to the linker flags before the other link pathes so an installed library is not taken, but the one supposed to be tested

- improved test printout (manual checking of exception messages)