Commits on Apr 21, 2020

1. Add support for generation of PLT markers in encoder …

   * -PLT switch added to opj_compress
   * Add a opj_encoder_set_extra_options() function that
     accepts a PLT=YES option, and could be expanded later
     for other uses.
   
   -------
   
   Testing with a Sentinel2 10m band, T36JTT_20160914T074612_B02.jp2,
   coming from S2A_MSIL1C_20160914T074612_N0204_R135_T36JTT_20160914T081456.SAFE
   
   Decompress it to TIFF:
   ```
   opj_uncompress -i T36JTT_20160914T074612_B02.jp2 -o T36JTT_20160914T074612_B02.tif
   ```
   
   Recompress it with similar parameters as original:
   ```
   opj_compress -n 5 -c [256,256],[256,256],[256,256],[256,256],[256,256] -t 1024,1024 -PLT -i T36JTT_20160914T074612_B02.tif -o T36JTT_20160914T074612_B02_PLT.jp2
   ```
   
   Dump codestream detail with GDAL dump_jp2.py utility (https://github.com/OSGeo/gdal/blob/master/gdal/swig/python/samples/dump_jp2.py)
   ```
   python dump_jp2.py T36JTT_20160914T074612_B02.jp2 > /tmp/dump_sentinel2_ori.txt
   python dump_jp2.py T36JTT_20160914T074612_B02_PLT.jp2 > /tmp/dump_sentinel2_openjpeg_plt.txt
   ```
   
   The diff between both show very similar structure, and identical number of packets in PLT markers
   
   Now testing with Kakadu (KDU803_Demo_Apps_for_Linux-x86-64_200210)
   
   Full file decompression:
   ```
   kdu_expand -i T36JTT_20160914T074612_B02_PLT.jp2 -o tmp.tif
   
   Consumed 121 tile-part(s) from a total of 121 tile(s).
   Consumed 80,318,806 codestream bytes (excluding any file format) = 5.329697
   bits/pel.
   Processed using the multi-threaded environment, with
       8 parallel threads of execution
   ```
   
   Partial decompresson (presumably using PLT markers):
   ```
   kdu_expand -i T36JTT_20160914T074612_B02.jp2 -o tmp.pgm -region "{0.5,0.5},{0.01,0.01}"
   kdu_expand -i T36JTT_20160914T074612_B02_PLT.jp2 -o tmp2.pgm  -region "{0.5,0.5},{0.01,0.01}"
   diff tmp.pgm tmp2.pgm && echo "same !"
   ```
   
   -------
   
   Funded by ESA for S2-MPC project

   

   rouault committed Apr 21, 2020
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