Use numbers rather than names for perspectives.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34541 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] diff now handles inequation tests

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34542 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e