version 1.2.0 release.

shjpeg_jpu: rewritten encode/decoded in line buffer mode. improved logic.
shjpeg_jpu: moved JPU related codes further to shjpeg_jpu.c.
shjpegtest: dump image even decode fails - for debug purpose.
shjpeg_common: refactor UIO init code.

Further clean up.

Added new test app - tests/mjpeg2jpeg.pl.

Version number is set to 1.0.0.

Fixed to use libtool versioning.

Fixed to install required headers.