Specific to a workflow of the Bibliotheca Hertziana.
python3 addmeta.py [-h] -u URI -i INPUTFILE -c CSVFILE [-o OUTPUTFILE]INPUTFILE and CSVFILE can be URLs.
Use level to nest TOC entries.
filename,canvas label,structure,level
p0001,59r,Philosophia magnetica per principia propria proposita et ad prima in suo genere promota,0
p0002,59v,[blank],1
p0003,60r,Lectori,1
Headers may be changed.