Accommodate correctly pluralized ViewStrings in GAP

[wilfwilson]

In a future version of GAP, some nouns will be correctly pluralised to match their number. For example, the ViewString for CyclicGroup(3); will change from <pc group of size 3 with 1 generators> to <pc group of size 3 with 1 generator>. (See gap-system/gap#3992 and gap-system/gap#4050 for more context.)

In this PR, I am trying maintain the backwards and forwards compatibility of this package with GAP. I have done this by suppressing the incorrectly spelled output in tests, and adopting the new output in the .tex files (which I assume are not run through any automated tests?)

Please let me know if this is sufficient - perhaps it was actually important to keep some of the output that I have now suppressed?

[codecov]

Codecov Report

Merging #19 (4f59f06) into master (3df23a1) will not change coverage.
The diff coverage is n/a.

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[olexandr-konovalov]

To me, looks sensible - tests will pass, it's ready to be released with the new version of GAP, and it a release happens earlier, one could tolerate slight discrepancy in the manual examples.