Add minimal-support constraints to stem base computation

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Change in interface of «explore-attributes» affected «context-from-clop»

fixed that

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Predeclared «support» for «stem-base»

forgot that

Signed-off-by: Daniel Borchmann <daniel.borchmann@mailbox.tu-dresden.de>
Merge branch 'master' into db/fcalib-interop

Conflicts:
	conexp-clj.org