[pdftex] [CWEB] Validation of PDF output fails

[Andreas Scherer]

Hello,

>> It appears that the outline macros in cwebmac.tex are quite sloppy at 
>> this time.
The same is, of course, true for 'pwebmac.tex', because its PDF macros 
are mostly based on 'cwebmac.tex.

In order to fix the same problem(s) in *pwebmac.tex*, I have to dig deep 
and take a different approach:
https://https://github.com/ascherer/web/commit/1351c539c22da40f2f049c09a3212a602fb39a1f

In the end, the WEB sources documented in the 'knuth-pdf' package 
produce 'valid' PDF files with PDFTeX, too.

Cheers,
Andreas