TODO-release

This is a list of things to do when releasing a new version.

- Update version number in CMakeLists.txt
- Update version number in src/Tests/guitar-adnote.xmz
- Update date of the new version in HISTORY.txt
- Update news on sourceforge website
- Upload source tarball to sourceforge website
- Update the "Linux/BSD/Source" link on http://zynaddsubfx.sourceforge.net/download.html (do that here : https://github.com/zynaddsubfx/zyn-website/blob/master/download.html )
- Update Copyright (mainly YEAR) info in src/UI/MasterUI.fl (note this is mentionned 2 times on line 5 and line 872)
- Check and update (if needed) the manpage file : doc/zynaddsubfx.1.txt
- Issue release announcement to linux-audio-announce, zynaddsubfx-user, kvr,
  linux-musicians