[FIX] reduce warnings for visual c++
[FIX] reduce warnings for visual c++

bestrauc/seqan,bestrauc/seqan,xenigmax/seqan,hannespetur/SeqAnHTS,hannespetur/SeqAnHTS,xenigmax/seqan,bestrauc/seqan,xenigmax/seqan,bestrauc/seqan,hannespetur/SeqAnHTS,hannespetur/SeqAnHTS,bestrauc/seqan,xenigmax/seqan,hannespetur/SeqAnHTS,hannespetur/SeqAnHTS,hannespetur/SeqAnHTS,bestrauc/seqan,bestrauc/seqan,xenigmax/seqan,hannespetur/SeqAnHTS,xenigmax/seqan,xenigmax/seqan,hannespetur/SeqAnHTS,bestrauc/seqan,xenigmax/seqan