Log Message:
jasper: updated to 2.0.20

2.0.20

* fixed several ISO/IEC 15444-4 conformance bugs

* fixed new variant of CVE-2016-9398

* disabled the MIF codec by default for security reasons (but it is still
  included in the library);
  in a future release, the MIF codec may also be excluded from the
  library by default

* added documentation for the I/O streams library API