- Fix to build against libpng-1.5.x.

- build on selected arches only

- Do not pack python2 files (needed for testing only)
- Do not pack conflicts files with openscad-mcad 2019.05

- ensure our CXXFLAGS instead of hardwired -O2
- E2K: explicit -std=c++11

- Merge with upstream git;
- rebuild with new librep.

- Rebuilt with libtiff5

- libdir fix for debuginfo.

- fixed build with new perl 5.26

- NMU: rebuild with libopencv-2.4.8.1;

- Check for data directory availability;
- simple check for Pulse Audio, else fall back to ALSA;
- current directory is now default data directory;
- ffmpeg/avconv configuration switch.

- Initial build.

- Initial build.