[FIX] Bringing back "plain" InternalPropertyMap again.

Especially for Dijkstra's algorithm, it is necessary to have a map for
atomic internal edge weights.
Merge pull request #637 from weese/feature/stream-fixes

[FIX] converted more file_io tutorials, bam_scanner_cache
Merge pull request #638 from holtgrewe/feature/fix-internal-property-map

[FIX] Bringing back "plain" InternalPropertyMap again.
[FIX] Yara: corrected the computation of match end position, responsible for matches ending beyond the end of the contig
[DOC] Yara: clarified help text
[FIX] cleaned up UCSC file and added format guessing from content and filename
Merge branch 'develop' of https://github.com/seqan/seqan into feature/stream-fixes