test: don't clutter the test directory
docs: improve ignore patterns
docs: don't use 'non-breaking space' character U+00a0
epstopdf is no longer needed by the asciidoc toolchain
docs: Rename images to placate asciidoc

Iimages with multiple dots perplex asciidoc when :ascii-ids: is specified,
and that setting is required to build the documentation on Debian Wheezy
and Jessie.
docs: Request ascii-ids

It's not clear whether this is the right thing to write, or if it's just
a workaround, but it does make asciidoc on debian wheezy/jessie happier.
docs: specify that we require texlive for each language

which only makes sense, as we are building docs in those languages
and want things like appropriate hyphenation.
docs: Don't explicitly request a dblatex encoding on newer(?) asciidoc

On Debian jessie (and wheezy) this leads to problems e.g., when
non-ACSII characters are used in code listings.  However, other
systems (e.g., Ubuntu Precise), this flag is required.  Skip
specifying the flag when a simple asciidoc source file can't be
built into a pdf document when the flag is specified.