[pdal] PDAL 1.3.0 Released

[Howard Butler]

After a few small updates found in RC1 by Sebastiaan, PDAL 1.3.0 is now released. You can download it from the website at http://www.pdal.io/download.html#download or obtain it via Docker (see Quickstart for details http://www.pdal.io/quickstart.html )

Thanks to everyone who has helped make this release including Andrew Bell, Brad Chambers, Sebastiaan Couwenberg, Logan Beyers, Connor Manning, Pete Gadomski, Mateusz Loskot, Mike Smith and others for bug reports, pull requests, tickets, and data verification. 

> The 1.3.0 release brings the following updates, enhancements and fixes:
> 
> - Command line parsing has been reworked to cause invalid options to emit an error message.  Stage options specified in pipelines and on the command line are handled similarly.
> - The dimension PlatformHeading has been renamed to Azimuth.  When looking up a dimension by name, the string "platformheading" is still accepted and returns Azimuth.
> - Errors detected by GDAL are no longer thrown as exceptions.  A log message is emitted instead.
> - Well-known dimensions are now added to PDAL by editing a JSON file, Dimension.json.
> - Linking with PDAL using CMake no longer requires explicit linking with curl, jsoncpp or arbiter libraries.
> - PDAL now searches for plugins in the following locations and order by default: ./lib, ../lib, ../bin, the location where PDAL was installed.
> - The '--debug' and '--verbose' options are no longer supported as stage options.  The '--verbose' option is accepted on the PDAL command line.  The '--debug' option is deprecated, and if specified on the command line is equivalent to '--verbose=3'.  One can enable logging programmatically by calling setLog() on a PipelineManager or a specific stage.
> - pdal::Dimension types are now  C++11 enumeration classes. The change may require editing any Stage implementations you might have and removing the extraneous ::Enum type specification.
> 
> Enhancements:
> 
> - Pipelines can now be read directly from standard input.
> - Files can now be read from Amazon S3 buckets by providing an appropriate URL.
> - Many new filters have been added: filters.approximatecoplanar, filters.eigenvalues, filters.estimaterank, filters.hag, filters.normal, filters.outlier, filters.pmf, filters.sample.  Most of these are algorithm extractions from the PCL library, with the hope of eliminating the need for PCL in some future PDAL release.
> - The PLY reader now loads dimensions that aren't predefined PDAL dimensions.
> - A '--driver' option has been added to allow a specific driver to be loaded for a file without regard to its extension.
> - The PDAL_DRIVER_PATH environment variable now accepts a list of locations to search for drivers.
> - Beta release quality drivers improvements in readers.greyhound
> - Beta quality implementation of Mongus and Zalik ground filter
> - Experimental implementation of Pingel et al. ground filter
> - writers.pcd enhancements by Logan Byers (binary, compression) -- requires PCL
> - Docker images upgraded to Ubuntu Xenial
> - Cyclone PTS reader -- readers.pts
> - skewness, kurtosis, stddev, and variance added to filters.stats output
> - Python API now available https://pypi.python.org/pypi/pdal
> 
> Fixes:
> 
> - A failure that may have resulted when using filters.hexbin to calculate density in the southern hemisphere has been corrected.
> - A failure to create the index file with 'pdal tindex' and GDAL 2.X has been fixed.
> - The '--tindex' option for the 'pdal tindex' command is now a positional option as specified in the documentation.
> - The icebridge reader now reads the X dimension as longitude and forces the value in the range (-180, 180].  It also properly uses the dimension Azimuth instead of ScanAngleRank.
> - An error in writers.pgpointcloud where it ignored SQL to be run at the end of the stage has been fixed.
> - An error that might incorrectly write values stored internally as bytes when written as a different data type has been fixed.
> - A problem where 'pdal info' wouldn't properly report dimension names not predefined by PDAL has been fixed.
> - A bug in filters.crop that wouldn't properly transform coordinates when provided the '--a_srs' option has been fixed.