- changed code in function 'do_POST()' class 'GetHanlder()' that affects reading and recording (download) debug_log files.For now takes over from parsing query debug_log the title string that is entered directly via HTML pages and consequently the name of the function it transmits or records

- 'constants.py' add the constants that are used to work with debug logs

git-svn-id: svn://192.168.1.162/sw_open/ais_readers/python/examples/web_api/trunk@68 0228885a-6ad7-41a9-bcf9-d0ec016d0fc8