Remove trailing white-space in a bunch of .tex files.

These are all in src/ and are probably both out-of-date and candidates for removal.

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Committing in a fixed version of the description.tex and other files
for the unwind library, which had become damaged and did not make.

Also fixed the Makefile for the pair library.

Modified Files:
hol98/src/pair/Manual/Makefile
hol98/src/unwind/Manual/description.tex
hol98/src/unwind/Manual/entries.tex
hol98/src/unwind/Manual/index.tex
hol98/src/unwind/Manual/unwind.tex
hol98/src/word/Manual/index.tex
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Initial revision