add semicons for equal and unequal dimension elements
scale all SVG-semicons to 32x32, remove ico and png folder, use 7z instead of tar.gz and zip

ICO and PNG folder are still in the downloads section
Merge branch 'master' of github.com:k00ni/semicon

Conflicts:
	README.md
	downloads/semicon.tar.gz
	downloads/semicon.zip
new semicons: datacube's dataset and data structure definition
Merge branch 'master' of https://github.com/k00ni/semicon