Merge branch 'jn/gitweb-caching-prep'

* jn/gitweb-caching-prep:
gitweb: Move generating page title to separate subroutine
gitweb: Add custom error handler using die_error
gitweb: Use nonlocal jump instead of 'exit' in die_error
gitweb: href(..., -path_info => 0|1)
Export more test-related variables when running external tests

diff --cc gitweb/gitweb.perl
Simple merge

diff --cc t/test-lib.sh
Simple merge