Update clients submodule.
Add customized .travis.yml build file.
Add missing libconfig-dev dependency.
Handle build on libconfig8 (does not have config_error_*() macros).
Fix config_error_* macro tests.
Depend on screen to satisfy configure.
Fix preprocessor result generation.
Protect additional config_error_* macro usages by #ifdef.
Add stupid test command.
Fix compilation error due typo in TCLFILTER code block.
Declare docbook files as encoded in UTF-8 (no recode needed).
Update build files.
Merge pull request #22 from liske/master

Make travis-ci working.