Fix 2 typos.
Tutorial specific example files have previously gone under Doc/examples
Update SearchIO tutorial language style
Add links to SearchIO documentation pages
Add links to SearchIO tutorial files
Update paths in tutorial after moving example files
Remove docstring reference to CompoundLocation (not merged yet).

Thanks Kai for spotting this.

No need for TravisCI testing, [ci skip]
Bump version ready for Biopython 1.61 release
Today's date for the Biopython 1.61 release
Fixes for epydoc warnings in SearchIO
Fix remaining epydoc warning in SearchIO
Fix epydoc literal sections in SearchIO docstrings
Fix epydoc warning in Bio/__init__.py
Post release version bump
Added the missing DTD file NCBI_Variation.mod.dtd
Nexus: handle & ignore LINK command when parsing (Bug #3408)
Merge branch 'master' into nexml