Adding catch for unit testing and adding `size` and `clear` method to tree#11

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psteinb wants to merge 11 commits intoDNCrane:masterfrom

psteinb:adding_catch_for_unit_testing

Commits on Feb 6, 2018

added catch 2.1.1 header file and created minimal .cpp accordingly
Peter Steinbach
committed
fixed signed/unsigned comparison
Peter Steinbach
committed
added catch2 based test case
Peter Steinbach
committed
added size and clear method to tree
Peter Steinbach
committed

Commits on Feb 12, 2018

moved all C++2003 files to its own subdirectory
Peter Steinbach
committed
ignoring emacs backup files
Peter Steinbach
committed
coming up with a setup for testing the tree
Peter Steinbach
committed
refactored example point
Peter Steinbach
committed
finished coding up the test suite
Peter Steinbach
committed
added tests target to Makefile
Peter Steinbach
committed

Commits on Feb 13, 2018

added benchmark of tree inserts, NN search and remove
Peter Steinbach
committed