start lon-then-lat
lon-then-lat for geodDist() and geodXY()
lon-then-lat for more functions

UPDATED: as.coastline(), equatorialToLocalHorizontal(), geodDist(),
geodXy(),  moonAngle(), read.lisst(), sunAngle(), and webtide()
more lon-then-lat work
more lon-then-lat argument switches

Now getting to functions having lon/lat deep in the arg list. My goal
is to have every pair oriented as lon-then-lat.

Tests:

    cd R
    git grep function | grep "lat.*lon"
more lon-then-lat work
more lon-then-lat cleanup in docs

Use
    git grep "lat.*lon"
to find problems, including just in sentences.
tighten NEWS for lon-then-lat
Merge branch 'lon-then-lat' into develop