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Update issue tracker URL in Entrez DTD message
Test EMBL file with missing sequence type in ID line.

Based on a bug report from Peter Thorpe.
Cope with missing sequence type in EMBL
Test EMBL files with missing sequence type in ID line
Fix corner case drawing small JAGGY features on circular diagrams.

The assertion that start <= tail <= head <= end could fail due
to minor floating point calculation differences for tail & head.

Bug report with test case from Peter Thorpe, thank you!