Test for non trivial functions
Checking of solution in random points
backward substitution for all variables - including those eliminated
during preprocessing
Merge branch 'master' of github.com:kjopek/ggsolver
BS update
Merge branch 'master' of https://github.com/kjopek/ggsolver.git

Conflicts:
	src/main/java/pl/edu/agh/mes/gg/twod/BS.java
tests
test2
cleanup
bug corrected
Merge remote-tracking branch 'origin/master-extbs' into interior

Conflicts:
	src/main/java/matrixgeneration/Tier.java
	src/main/java/pl/edu/agh/mes/gg/Vertex.java
	src/main/java/pl/edu/agh/mes/gg/twod/A.java
	src/main/java/pl/edu/agh/mes/gg/twod/A1.java
	src/main/java/pl/edu/agh/mes/gg/twod/A2.java
	src/main/java/pl/edu/agh/mes/gg/twod/AN.java
	src/main/java/pl/edu/agh/mes/gg/twod/BS.java