Release v0.12.17

• implement add/1, skip/2 functions
• implement --library-path option as the alias of -L option
• fix reduce syntax to emit results for each initial value
• fix last/1 to yield no values when the argument yields no values
• fix limit/2 to emit an error on negative count
• fix @uri and @urid formats not to convert space between plus sign
• fix resolving search paths of import statements in the query
• improve time functions to accept fewer element arrays