NDT使用openmp加速

开源代码地址：git@github.com:koide3/ndt_omp.git

该开源代码，主要测试了普通NDT以及使用openmp加速之后的ndt匹配效率及精度问题。我实际测试了大尺度的点云地图匹配(室外200mx50m)，得到的结果是GICP匹配效果差很容易飘（如果想要更深层次测试GICP的话，可以去关注一下git上面fast_gicp这个包），NDT以及NDT_OMP匹配效果比较稳定。

开源代码的固定帧测试结果：

--- pcl::GICP ---
single : 300.916[msec]
10times: 1450.77[msec]
fitness: 0.2203--- pclomp::GICP ---
single : 221.72[msec]
10times: 3749.15[msec]
fitness: 0.220517			--- pcl::NDT ---
single : 423.835[msec]
10times: 4351.72[msec]
fitness: 0.213937--- pclomp::NDT (KDTREE, 1 threads) ---
single : 365.468[msec]
10times: 3429.27[msec]
fitness: 0.213937--- pclomp::NDT (DIRECT7, 1 threads) ---
single : 150.935[msec]
10times: 1405.41[msec]
fitness: 0.214205--- pclomp::NDT (DIRECT1, 1 threads) ---
single : 55.7785[msec]
10times: 429.982[msec]
fitness: 0.208511--- pclomp::NDT (KDTREE, 8 threads) ---
single : 121.142[msec]
10times: 957.075[msec]
fitness: 0.213937--- pclomp::NDT (DIRECT7, 8 threads) ---
single : 71.5185[msec]
10times: 508.991[msec]
fitness: 0.214205--- pclomp::NDT (DIRECT1, 8 threads) ---
single : 54.9451[msec]
10times: 329.652[msec]
fitness: 0.208511

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