use bibdk_yaz to convert ccl + simpler method for converting xml to php array
remove unused file
remove xml functions. Simpler method implemented
update subject hierarchy XML
add update_hook for new XML
add already parsed subject hierarchy
fallback if bibdk_yaz is not installed
check if ccl value isset
reuse connection in PhpYazConverter
update json with correct cql
update test xml
small refactoring
update test
clean up info file
update webtest
update unit test
update to utf-8
new xml, hopefully without encoding errors
update json file
Merge branch 'feature/1494-subject_hierarchy_with_yaz' into develop