[pdal] pgpointcloud selector filter and max_capacity

[Oscar Martinez Rubi]

Hi,

After 1.5 years using an old PDAL installation I convinced myself to try 
the latest one.

The first issue I encountered is that since a while ago, PDAL uses c++11 
features, and the gcc that comes with CentOS 6 was not happy with that, 
so I had to install a newer gcc from source (4.8) in order to make it 
compile. Also I had to use boost 1.55 (1.57 was also giving some problems)

I use PDAL to load in postgres,so I use the pgpointcloud plugin. In the 
latest PDAL I miss a couple of things that I can not find anymore:

1 - The selector filter. I only want to load X, Y and Z. How can I do 
that in current PDAL?
2 - There seems to be a hardcoded maximum of 400 points per patch in the 
pgpointcloud writer. I know that is the recommended patch size but for 
massive point clouds I use larger number which use to be possible with 
older PDALs but not anymore.

Thanks!

Regards,

Oscar