Convert fixed buffers to dynamic allocations.

- suffix_split()
- add_alternative_with_subscr()
- mprefix_split()

- Fix bug in changing SANEMORPHISM to dynamic allocation.
Fix wall print condition in case of no wall(s).

(If no walls, it tried to suppress the first and last words.)
Merge pull request #28 from ampli/print

Fix wall print condition in case of no wall(s).
Merge pull request #27 from ampli/memory

Convert fixed buffers to dynamic allocations.