#84: fixed atEnd() and atBegin() for StringSets added functions with all const combinations for parameters
#84: fixed atEnd() and atBegin() for StringSets
added functions with all const combinations for parameters

git-svn-id: a7f2a8f7432d210e972fb03898013d213e2b549b@7811 e6417c60-b987-48fd-844e-b20f0fcc1017

gkno/seqan,gkno/seqan,gkno/seqan,gkno/seqan,gkno/seqan,gkno/seqan,gkno/seqan