autogen.sh: Add an emptyline before final instruction
_page.html: Set full paths in _links
configure: Only print WWW_ROOT if we have it

Issue #22.
configure: Set a default $PREFIX

Issue #22.
configure: Prepend PREFIX before WWW_ROOT

Issue #22.
build/log: Don't install log data

Issue #22.
build/www: Add 'install-www' synomym for 'local'

Issue #22.
build/www: Add a 'clean-www' target

Issue #22.
build/www: Export build on 'make install'
build: Add 'install-www' to toplevel targets

Issue #22.
build: Add 'clean-www' to toplevel targets

Issue #22.
build: Document install function in 'make help'

Issue #22.
www: Add 'autocomplete=off' attribute to input text