added package.xml so that libpointmatcher can be built as an external catkin package
working on support of misordered descriptors
continuing reshuffling of badly ordered descriptors for loadCSV
merging over from master
should now support reordering of desc columns in CSV files
loading PCD files (features only)
saving PCD point clouds
writing unit tests for PLY import/export
doc for PCD Import/Export
fixed descriptor support in loading PCD files
new unit tests for loading/saving different file formats
updated IO doc for new formats
Merge branch 'master' of https://github.com/ethz-asl/libpointmatcher