Each unit test can now be run with a separate test binary, making all unit tests more flexible.

Update emulation based acceptance tests on the basis of the new deduplicated warning output

refactored cwe476 to add stack tracking

Added acceptance tests for more CPU-architectures. Added acceptance tests for PE-files for x86.

adds check_path flag to cwe_checker for finding paths from user input functions to CWE hits.

* Added feature to compiler test cases with more than one compiler. Added clang as first examples. Fixed test cases to work with gcc

* Added acceptance tests for clang x64, adjusted Travis scripts (now
runs also unittests), install_cross_compilers installs also clang.

* Skips test for cwe415, which is broken on clang + Ubuntu 16.04

* Added feature to compiler test cases with more than one compiler. Added clang as first examples. Fixed test cases to work with gcc

* Added acceptance tests for clang x64, adjusted Travis scripts (now
runs also unittests), install_cross_compilers installs also clang.

* Skips test for cwe415, which is broken on clang + Ubuntu 16.04

* Added change to CHANGES.md

* Fixed test issue: test for json output was pre-compiler suffix.

[tests] build test cases with Makefile; install cross compilers depending on Ubuntu version; commented out three broken acceptance tests

* Building artificial samples with scons-2, removed makefile