Helma Dik's version of Herodotus Histories

This is very long overdue, but this pull request is for the changes @helmadik has made to clean up Herodotus Histories.

I did a few things to make the comparison with the Perseus canonical P4 version a bit easier:

1. the first commit on this branch are just some cleanup changes to the P4 version, to convert divX to div and remove milestone[@unit='para']. I'm not sure whether I'm right, but it seemed to me that the para milestones are irrelevant now that every section is wrapped in a p tag already, and they were causing some erroneous differences due to placement of the milestone before or after the div breaks (probably caused by differences in way the texts were cts-zied)

2. the second commit on this branch is just to clean up the formatting and indenting of the P4 canonical version, again to limit erroneous differences.

3. the third commit on this branch is Helma's version, but it includes some changes that I made to it:
1) Helma added q tags around many of the quotes, and specified the who attribute to say who was speaking. Many of these crossed the section milestones which are part of the CTS hierarchy, so I ran a transform to close and reopen the q tags at the end and start of the intervening milestones. I had to the do the same for one quote tag too.
2) I CTS-ized the text, converting the section and chapter milestones to divs
3) Cleaned up formatting and indentation

I'm issuing the pull request because I think it might be good to try to incorporate Helma's improvements now before we port this text to EpiDoc as it will be easier to compare apples to apples.