Removing working directory imports.

Needed for having more build directories from same checkout directory
(not fully done yet).
ramove most CFIle methods from SWIG
draft of how to reduce swig's output size
fix include guard endif
Fix memory leak in StringFeatures
CID 26248, 26247, 26246, 26241, 26239, 26236, 26235, 26236, 26234
Refactor CPack [ci skip]
Fix ViennaCL detection [ci skip]
blacklist mmd2 example
close is needed by ruby
comment out syntax failure in clang python modular travis
Fix trivial warnings (unused variables) in Statistics unit test.
remove all print statements
Merge pull request #2567 from karlnapf/develop

remove most from SWIG for some File classes and SGVector
Merge pull request #2570 from tklein23/remove_working_dir_imports

Removing working directory imports.
Fix more warnings from the buildbot in deb3 Python modular.
Merge pull request #2573 from iglesias/fix_warnings

Fix trivial warnings (unused variables) in Statistics unit test.
Move tokenize from CSVFile to StreamingAsciiFile.