about:license: compact the entries for the Regents

expand the mention for a copyright

extend about:license don't mention only all the copyright holder, put the whole blabbering^W text of the license as well. Some names were also missing before. It was unintentional.

fix build out-of-tree The issue with building out-of-tree was that some pages were generated by autoconf in $(builddir) and others were as-in in $(srcdir). While it was possible to use the right combination of $(builddir)/$(srcdir), just move everything as .in and generate every page during the configure step.