[FEATURE] Finder: imported new finder as Finder2, merged it with the old ext::Finder

git-svn-id: http://svn.seqan.de/seqan/trunk@14584 e6417c60-b987-48fd-844e-b20f0fcc1017
[TESTS] Finder: added some basic backtracking tests

git-svn-id: http://svn.seqan.de/seqan/trunk@14585 e6417c60-b987-48fd-844e-b20f0fcc1017
[INTERNAL] Search/Join: updated apps to use the new Finder

git-svn-id: http://svn.seqan.de/seqan/trunk@14586 e6417c60-b987-48fd-844e-b20f0fcc1017