Rename download/Temoa*pdf

TemoaProject is the build name, but TemoaDocumentation.pdf is a better
PDF name.  An inconsistency that probably should be fixed elsewhere, but
this was quick for now.
Test SSH before attempting build.

Also, add a forgotten downloadable.
Reduce Windows instructions to what we actually support.
Improve wording.

'Algebraic Equations' was, I think, a holdover from our wiki.
Documentation is now more appopriate.
Reorder creation.

If there's an error, let's quit early.  The idea is that the
documentation is the slow part.  Everything else is negliglable.  So
let's make the documentation last.
Update the installation instructions.

The reality is that "stable" Coopr is rarely stable and is perpetually
out of date.  Let's just tell our users to run --trunk.
Slightly update formatting for easier webpage viewing.
Update the installation instruction wording and look.
One link for Coopr is enough.