Generate all thumbnails with constant height
Open all external links in new tabs
Remove prefix from the subnav-footer partial

The prefix was included in the URL in
3e47bb75a2aa4c9bde284b54926429ed2f5f2719
s/Julia Schorpp/Jan Therm/

Neuer Jugendleiter.
Update facebook blurb
Make Schüler-/Jugendkapelle images a bit smaller
Add "Dirigent" heading

This makes the page more symmetrical with "Ehrendirigent".
Clarify partner page

We don't link other local bands there.
Add Lisa as Schriftführer
Amend chronicle with 2013 changes