TommyDS v2.0

• Fixed a Segmentation Fault bug in the trie_inplace container when inserting
  duplicate elements.
• Faster array and hashlin implementation when accessing elements.
• Added new hashtable functions to iterate over all the elements.
• Added a new tommy_calloc() function used for allocating initialized memory.
  If you redefined tommy_malloc(), likely you have to redefine also tommy_calloc().
• Reached 100% code coverage in the regression test.
• Different source code organization.
• Added benchmark comparison with Binary Search Tesseract by Gregorius van
  den Hoven.