Renamed more variables to English.
Added documentation about deprecated identity matrices.
Deprecate SpTeisendusMaatriks2x2 and SpTeisendusMaatriks in favour of spTransformation (uses one less argument, doesn't have Estonian name).
Replace deprecated SpTeisendusMaatriks2x2 and SpTeisendusMaatriks uses.
More changes, renaming of arguments etc.
Deprecated VardadSolmes and VardaPikkus in favour of elementsInNode and elementLengths.