details-table.jinja: add button to publish hidden flights
flights-table.jinja: render hidden flights italic
INSTALL.md: fix note about postgis 2.1.3
Merge branch 'privacy_level'
Merge branch 'upload_verynew'
INSTALL.md: postgis legacy not needed anymore
INSTALL.md: update XCSoar section
INSTALL.md: update welt2000 import section
upload/details.jinja: fix icons
forms/upload.py: add pilot and co-pilot name