[FIX] fixed bug #1108; Array String can be used in External and MMap Strings now; fixed SinglePoolAllocator to support items smaller than a pointer

git-svn-id: http://svn.seqan.de/seqan/trunk@14581 e6417c60-b987-48fd-844e-b20f0fcc1017
[FEATURE] added test for ticket #1108

git-svn-id: http://svn.seqan.de/seqan/trunk@14582 e6417c60-b987-48fd-844e-b20f0fcc1017
[FIX] fixed bug #1111


git-svn-id: http://svn.seqan.de/seqan/trunk@14583 e6417c60-b987-48fd-844e-b20f0fcc1017