Revise pwbib_unused.txt

[funderburkjim]

The file pwbib_unused.txt was revised. This file contains the literary source abbreviations that

• occur in the PW bibliography
• But do NOT occur in any instances within pw.txt.

The file currently has 28 such abbreviations.

Further, modifications to crefmatch.py were made so that pwbib_unused.txt is used, rather than the formerly used python list.

The matching programs were rerun, with no changes to the results.

Now there are three components of pwbib that relate to the matching of pw.txt literary source instances:

• pwbib1.txt - all 503 literary source references mentioned in the digitization of the pw bibliography
• pwbib_new.txt - 302 literary source reference abbreviations that occur in one or more instances of pw.txt literary sources
• pwbib_unused.txt 28 literary source abbreviations from pwbib1.txt that do not occur in pw.txt.

A fourth component might be the 16 abbreviations that occur more than once in pwbib1.txt. (these are listed at the bottom of crefmatch_log.txt).

[gasyoun]

• pwbib1.txt - mentioned in prefaces, actually occurs
• pwbib_new.txt - not mentioned, but occurs
• pwbib_unused.txt - mentioned in prefaces, not used

4th not needed.

[funderburkjim]

Some duplicates were noted in pwbib_new. After duplicate removal, 287 distinct abbreviations remain.

[Andhrabharati]

@funderburkjim

With your recent work on pwk ls updation (taking the AB version as a guide), this issue is out-dated and could be closed now.