Merge pull request #11 from kz0817/unwind-jump-buffers-on-exception

Unwind jump buffers to avoid an invalid memory access on an unhandled exception

Patch by Kazuhiro Yamato. Thanks!!!
Revert adding cut_test_get_jump_buffer()

It is a needless function. We can implement the same feature by
cut_test_context_get_jump_buffer().
test: remove needless code
deb rpm: add 1.2.3 release entry
doc: update latest release version to 1.2.3
doc: update release version
doc: add missing CFLAGS when compiling cutter-scan.c

Without this change, make dist fails.
deb: update to recent release
doc: update description about install procedure on Fedora
packages: drop Fedora
doc: update description about apt lines on Debian
doc: update release target
doc: update description about apt lines on Ubuntu
rpm: drop fedora

Because Cutter packages are released from Fedora official yum repository.
apt: use GStreamer 1.0
doc; add 1.2.3 release entry
po: update file list
doc: add 1.2.3 release entry
Remove garbage "*"
deb: drop GStreamer plugins

Keeping this package usability, we must do:

* Consider to port to GStreamer 1.0.
  we need to follow API changes and so on.
* Need to maintain build script for the platform which doesn't provides
  GStreamer 1.0 series.