util/definitions/cs -- content_sha.txt
pass1 -- content-check report enhanced
[cs] revision of another part of ch. 4
[cs] revision of chapter 4 finished
[cs] snippet updated in chapter 1
content_sha.txt format changed
[cs] first changes during revision of chapter 5
util/plan.txt added -- planning the next implementation steps
pass1.py: SHA-1 hex digest of the element is now stored in elem.sha
pass1.py: reverse lookup table for the elements added
util/definitions - content after changes in ch. 1 captured
some tests