Implemented ll_is_subset
Added source files to CMakeLists.txt
Fixed a missing reference operator
Added missing file to CMakeLists
Added declaration of ll_is_subset
Added ll_is_subset tests
Fixed a return value for {ll,avl}_is_subset
Added subset tests
Fixes various return values that were switched
Added missing bracket
Fixed a bug in the node_is_subset function
Added more documentation
Fixed return values of ht_equal
Fixed logic error inversion
Added ht_equal tests
Implemened r_set_equal
Added tests for r_set_equal
Added config_cmp to r_set_equal for true equality
Removed avl_equal definition
Fixed function signature and added documentation