1.6.0
configure: drop user-nsswitch.conf support
lib: fix coverity warnings
selinux: correct error message
cli: add is-feature-enabled
lib: add pkgconfig file
lib: fix use of potentially dangerous function
lib: use better names for exported functions
lib: reorganize header files
lib: move nsswitch.conf related functions to its own source file
lib: create donf database directory if it does not exist