Add: tests for simple delete operation
Added test for destroying multiple nodes
Fix: return negative error number here
Fix: Check before regen_metadata() if there is a root node left
Merge pull request #249 from matthiasbeyer/add-test_avl_del

Testing for avl_del() operations
Added common.h for set debug macro
Add debug prints for r_set_new()
Add debug prints for r_set_destroy()
Add debug print for r_set_insert()
Add debug print for r_set_remove()
Add debug print for r_set_contains()
Add debug print for r_set_cardinality()
Add debug header in bloom.c
Merge pull request #255 from matthiasbeyer/add-debug_printing_set

Add debug printing for set type
Add debug prints for bloom_from_hash()
Add debug print for bloom_may_contain()
Add debug print for bloom_may_have_common()
Merge pull request #256 from matthiasbeyer/add-debug_printing_bloom

Add debug printing for bloom type
Add helper for comparing config objects
Merge pull request #258 from matthiasbeyer/add-config_cmp_helper

Add helper for comparing config objects