fixed bug in CMake script checking for C++11-compliant compiler for CMake<2.8

- older CMake versions do not know the CMAKE_CXX_COMPILER_VERSION variable, which introduced a bug in the version check for C++11 compliance
- added a compatability variable for older CMake versions into CMakeCompatibility.cmake
- fixes eudaq/eudaq#45
made error message on failed C++11 compiler check fatal and more verbose
changed CMake print script to use routine of CMakeCompatability.cmake for compiler version parsing
added command to fetch git tags to documentation
removed counted pointer
removed Counted_ptr
Merge remote-tracking branch 'upstream/master' into temp
replaced the assignment of the a raw pointer with an assignment of a shared_pointer
removed counted_ptr from miniTLU project

not yet tested
removed counted_ptr

not tested
Merge pull request #50 from RPeschke/main

removed counted_ptr
fixes CMake script for finding ZestSC1 files

- sym linked directories were not correctly traversed -- fixed by setting CMake policy 9 accordingly
fixes parsing of EUDAQ version number from git status and adds some additional information
updated release notes with info on counted_ptr removal