Merge PR#163 to draft-1.5 from ASPRSorg/issue-82-clarification-of-classification-lookup-vlr

Add deprecation notice of the Classification Lookup VLR (§4.1).
Add introductory paragraph to Optional VLR Definitions section.

Author: esilvia

source/01_intro.txt

@@ -43,6 +43,8 @@ The additions of LAS 1.5 include (topic links included when applicable):
     `I-129 <https://github.com/ASPRSorg/LAS/issues/129>`_)
   * Clarify requirement that the Extra Bytes VLR must be unique.
     (`I-150 <https://github.com/ASPRSorg/LAS/issues/150>`_)
+  * Deprecated Classification Lookup VLR.
+    (`I-82 <https://github.com/ASPRSorg/LAS/issues/82>`_)
 
 
 Conformance

source/04_optional_vlrs.txt

@@ -7,7 +7,12 @@
 Optional VLR Definitions
 --------------------------------------------------------------------------------
 
-Classification Lookup
+Definitions for official :ref:`vlrdef_label` and :ref:`evlrdef_label` 
+are provided in this section as a means to extend the LAS file format.
+Additional VLR and EVLR definitions contributed by the LAS Working Group and the 
+LAS community can be found on the :ref:`Official LAS Wiki <laswiki_link>`.
+
+Classification Lookup (Deprecated)
 ................................................................................
 
 +----------------------------+-----------------------------------+
@@ -25,6 +30,11 @@ Classification Lookup
         char Description[15];
     }; //total of 16 bytes
 
+The legacy Classification Lookup VLR (Record ID 0) has been a feature of the LAS specification
+since LAS 1.0. This VLR is deprecated in LAS 1.5 due to the limitation of
+15 characters being insufficient for a detailed description. An updated
+version of the VLR may be found on the :ref:`Official LAS Wiki <laswiki_link>`.
+
 
 Text Area Description
 ................................................................................
@@ -237,6 +247,10 @@ updating a record such as projection information where a new EVLR is appended
 to the end of the LAS file. The existing VLR which has been superseded must be
 marked with the SUPERSEDED Record ID.
 
+.. raw:: latex
+
+    \newpage
+
 .. _fwf_descriptor_label:
 
 Waveform Packet Descriptor