Gh52 handling internal paragraphs gracefully

[FrankMittelbach]

This is fixing #52 but so far only a first draft. Needs more checking and additional tests.

A number of changes in the test files are unrelated because of additions in the kernel (suite hasn't run for a while it seems).

[wspr]

I don't know why this wasn't closed back at the time, this has been released some time back