Update for slk helpers 1.1.0

• slk group is activated now
• pyslk extended by new slk_helpers commands: version, iscached and search_limited; correspond to pyslk.slk_helpers_version(...), pyslk.slk_iscached(...) and pyslk.slk_search_limited(...)
• path containing //, /../ and /./ now properly work with all commands
• parsers extended by parsers.slk_isached_bool and parsers.slk_search_limited_int