new package: Seqan (bioinformatics) (#7588)
new package: Seqan (bioinformatics) (#7588)

* new package: Seqan (bioinformatics)

* add compiler requirements as conflicts

* fix typo

* add dependency types

* correct checksum

krafczyk/spack,mfherbst/spack,iulian787/spack,EmreAtes/spack,tmerrick1/spack,iulian787/spack,LLNL/spack,EmreAtes/spack,iulian787/spack,krafczyk/spack,EmreAtes/spack,iulian787/spack,krafczyk/spack,iulian787/spack,mfherbst/spack,matthiasdiener/spack,LLNL/spack,matthiasdiener/spack,mfherbst/spack,EmreAtes/spack,tmerrick1/spack,LLNL/spack,tmerrick1/spack,mfherbst/spack,LLNL/spack,EmreAtes/spack,tmerrick1/spack,matthiasdiener/spack,krafczyk/spack,mfherbst/spack,LLNL/spack,krafczyk/spack,matthiasdiener/spack,tmerrick1/spack,matthiasdiener/spack