materials when using the new LuxCore rendering modes
- Because upstream did not use different tag names for LuxCore and LuxRender
this time, avoid distfile name clash by using .tar.gz format for smaller
distfile (3.1M) and .tar.bz2 for the larger one (28M)
- Ensure that correct build number is reported in the "About" dialog box
- Fix USES and DISTVERSION check for version 1.4 support while I'm here
0c54ca5c50