Merge branch 'develop' into 'master'

Data directory lookup fix

See merge request !3

.gitlab-ci.yml

-image: clarinpl/cpp
+image: clarinpl/cpp:16.04
 
 stages:
   - build

libtoki/CMakeLists.txt

@@ -136,7 +136,7 @@ endif(NOT ${LibXML++_PKGCONF_VERSION} VERSION_LESS 2.40)
 	)
 	install(
 		DIRECTORY ${LIBTOKI_SRC_DATA_DIR}/
-		DESTINATION ${LIBTOKI_INSTALL_DATA_DIR}
+		DESTINATION ${CMAKE_INSTALL_PREFIX}/${LIBTOKI_INSTALL_DATA_DIR}
 		FILES_MATCHING PATTERN "*.ini"
 		PATTERN "*.srx"
 		PATTERN "*.lex"