[metapost] Fix formatting glitches.

[Andreas Scherer]

Dear reader,

the attached git-generated patch file---as always prepared with loving 
care---contains CWEB-related changes that try to fix the more obvious 
formatting glitches in the first 44 sections of MP.W, i.e., chapters 
INTRODUCTION and THE CHARACTER SET.

Of course, these changes address only a tiny fraction of the MP.W source 
file. I do not have the resources to dig into the CWEB code of the 
MetaPost system more seriously at this time. Obviously, there is a lot 
of work to do in order to prepare even this one---albeit the 
largest---source module of MetaPost for inclusion in the 
https://ctan.org/pkg/knuth-pdf and https://ctan.org/pkg/knuth-hint 
packages anytime soon. Volunteers welcome!

Happy hacking!
Andreas
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