[DOC] Add explanations to documentation of AlignConfig.


git-svn-id: http://svn.seqan.de/seqan/trunk@14733 e6417c60-b987-48fd-844e-b20f0fcc1017
[DOC] Adding documentation for Gaps#countCharacters


git-svn-id: http://svn.seqan.de/seqan/trunk@14734 e6417c60-b987-48fd-844e-b20f0fcc1017