add description id and title to detailed display

As requested in Mantis issue 850
make index browse script executable
fix shebang lines for db manage scripts on Ubuntu

Ubuntu lacks `/bin/env`, instead having `/usr/bin/env`
enable indexing of subject finder clusters only
do not checksum subject finder cluster records

Prevents ObjectAlreadyExistsException warning, and subsequent
skipping indexing of that subject cluster.
fix dependency links in Travis CI config

Avoid annoying DNS problem with cheshire3.org
update cheshire3 requirement for latest release
docs: update README date and build status image