fix download link
README: restore empty line at top.

All DeepaMehta README files begin with one empty line.

Every headline needs space above. So does the first one.
It creates room for breathing.
Geomaps fix: deleting all child topics (#414).

Deleting e.g. all the Person's Email Addresses works.

Close ticket 414.
Merge branch 'master' into attach-comp-value