PDAL/PDAL — pull request #351 by gadomski (2014-05-06 16:58:32+00:00)
Title: Improve the las reader's file signature error

Catch the las header's invalid file signature error and improve the error message, mostly by including the file name. In order to provide the filename under more circumstances, set the "filename" option when using the filename-only `las::Reader` constructor.

Fixes #277.