syntax upgrade to lily 2.19
Te Deum: mark 'from here on omittable' unified with psalter
canticle Ap 19: lettrine, zero \parindent

I just haven't realized until today that this 'hardcoded' canticle misses the lettrine all other
psalms and canticles have.
The canticle 1 Tim 3 also misses one, but there the first letter is a "rubric" and thus I don't
see it as appropriate to make it lettrine.

As the canticle Ap 19 has very short verses (usually not filling a single line),
it looks better without paragraph indentation.