Merge remote-tracking branch 'eserte/master' into world
Merge branch 'world' of ssh://git.bbbike.org/home/git/bbbike into world
add pbf2opl
add libosmium OPL format
enable OPL format
update news: OPL
uppercase OPL
indent
update
document libosmium OPL format
fail with non-zero exit if the pipe fails, e.g. a converter crashed

set -o pipefail # bash only