Éric Lemoine 0670d95d4b Add a PC_Full_Version function
This commit adds a PC_Full_Version function whose output is as follows:

	# select pc_full_version();
										 pc_full_version
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	 POINTCLOUD="1.1.0" PGSQL="96" LIBXML2="2.9.4" LIBGHT enabled=false LAZPERF enabled=false
	(1 row)
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