Added implementation for ht_find()
Renamed function: avl_add() -> avl_insert()
Merge pull request #162 from matthiasbeyer/fix-insertion_func_naming

Renamed function: avl_add() -> avl_insert()
Merge pull request #160 from matthiasbeyer/implement-ht_find

Added implementation for ht_find()
Added debug print helper for linkedlist
Added debug printing for ll_destroy()
Added debug printing for ll_insert()
Added debug printing for ll_delete()
Merge pull request #152 from matthiasbeyer/add-debug_printing_ll

Add debug printing for ll
Added set.c file and r_set type implementation
Reimplement adl_add
Merge pull request #163 from neithernut/reimplement-avl_add

Reimplement avl_add
Merge pull request #178 from matthiasbeyer/implement-r_set_type

r_set type implementation
Added testing file for AVL implementation
Added allocation test for avl test
Added test for testing allocation and deleting for AVL
Added test for adding data to the avl tree
Added test for adding and destroying afterwards
Added test for adding multiple elements
Added test for adding multiple and destroying AVL afterwards