respect compiler flags of system rpm config on demand when building RELEASE
add -DSKIP_LATEX to skip generation of LaTeX-based PDF-generation when invoking `make docs`
new version 3.0.5
Merge pull request #48 from bjoern-esser/master

two small improvements to the buildtools
compiler opti-flag is -O not -0 (zero)
Merge pull request #49 from bjoern-esser/master

compiler opti-flag is -O not -0 (zero)
Fix release package with git tag
Merge remote-tracking branch 'upstream/master'