[trunk] add a check on mandatory headers in Main Header (fixes issue 408)
[trunk] resets code-blocks reused for other tiles than the first one (fixes issue 418)
[trunk] resets resno_decoded for each tile (fixes issue 399)
[trunk] Added new non-regression tests from foxit issues

Update issue 415
[trunk] workaround to make MD5 work under valgrind on MacOSX (fixes issue 410)
[trunk] re-arrange contributors alphabetically and add Matthieu Darbois
[trunk] add Aaron Boxer as contributor