xWalk P.Tebt.Quen. and BGU 21 and BGU 22

[jcowey]

Carmen, would you please xwalk the files from

https://docs.google.com/spreadsheets/d/1ToGHBABH6pFdgoHLHw4zk2APYUAX0CbDX47aXnU46uU/edit#gid=606822116

to both papyri.info (with the usual pull request)

and

aquilaHGV

there is one modified file
all other files are completely new to the system as far as I can see.

by doing this #211 and #201 and #202 will be processed