Removed references to point formats without Time. (#6, #118)

Author: esilvia

source/02.04_header.sub

@@ -431,8 +431,7 @@ generally) GPS Time values stored with the point records in this LAS file. The
 GPS Time in this field will be in the same encoding described in the file's
 :ref:`Global Encoding <globalencoding_link>` field.
 
-These values must be set to zero if there are no point records in the file,
-if the file utilizes a point record format not supporting GPS Time, or if
+These values must be set to zero if there are no point records in the file or if
 all point records within the file have GPS Time values set to zero,
 such as for certain :ref:`Aggregate Model Systems <aggregate_link>`.
 
@@ -451,7 +450,6 @@ and year ranges that users are encouraged to use to maximize compatibility betwe
 This value must be set to zero if there are no point records in the file,
 if the file is derived from a source not utilizing GPS Time
 (such as for certain :ref:`Aggregate Model Systems <aggregate_link>`),
-if the file utilizes a point record format not supporting GPS Time, or if
-the Time Offset Flag is unset.
+or if the Time Offset Flag is unset.
 
 It is invalid for the GPS Time Type bit to be unset if the Offset Time Flag bit is set.