Restructuring conexp.contrib.algorithms, and adding parallel-canonical-base

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Removed some testing code from linclosure implementation

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Make tests work again for conexp.contrib.algorithms

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Tests for new functions

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>