LAS 1.5 support

maintenance release

• LASMessage concept
• fix integer overflow, fix fseek, fix memory leak

• UTF16 filename support and windows unicode support
• Fix extra_bytes selective decompression PDAL/PDAL#2799 #62
• Compatibility mode fix #60

• 1024 AC_BUFFER_SIZE to 4096 for propagate_carry() overflow
• Fix two small memory leaks

• FastAC now properly BSD-licensed. See #55 for details

Two important fixes were made for 3.3.1:

• writer: sanity check for consistent legacy and extended classification
• reader: zero the legacy classification whenever extended classification is larger than 31

• bug fix when writing 4,294,967,296 or more points uncompressed to LAS
• fix for LASzip v4 decompression of WavePacket part of PRDF 9 and 10
• upped to 3.2 r9 for bug fix in multi-channel NIR decompression
• fix for v4 decompression of WavePacket part of PRDF 9 and 10

• Decompression bug for PRDF 8 or 10 when the scanner channel and the NIR field are populated.

** NOTE: The version number is 3.2.8 to be brought in line with the patch version
number present in LAStools, which had been incremented without being kept in sync
with the laszip.org version. We regret the error. The following bug fixes have been
made since 3.2.2:

• 7 November 2018 -- upped to 3.2 r8 for identical legacy and extended flags check
• 20 October 2018 -- upped to 3.2 r7 for rare bug in LASinterval::merge_intervals()
• 5 October 2018 -- upped to 3.2 r6 for corrected 'is_empty' return value
• 28 September 2018 -- upped to 3.2 r5 for fix in extended classification writing

3.2.2 27-MAR-18

• A version number was not properly incremented to 3.2.1, necessitating a new
  release to eliminate confusion.