start build matrix
Merge branch 'master' into quick
don't install LaTeX with quick builds
Merge branch 'master' into quick
Merge branch 'master' into quick
debug output
Merge branch 'master' into quick
sudo -E
Merge branch 'master' into quick

Conflicts:
	.travis.yml
echo to stderr
use R CMD build and check instead of crant
Merge branch 'master' into quick

Conflicts:
	.travis.yml
deduct mode from RTRAVISTYPE
choice by RTRAVISTYPE in one place
build full mode, too
language: c
remove comment
Merge branch 'quick'
Merge branch 'c'