Fix R CMD check issues related to R 4.3.0

[GegznaV]

Due to changes in R 4.3.0 (or packages), R CMD check and some unit tests fail. E.g., tests show that some plots changed.

[GegznaV]

For plots, it seams, that the default lattice color schemes have changed:

If anyone has more time to investigate the changes and provide a reference/link, your efforts are welcome.

[GegznaV]

wc related tests (randomly) fail on Windows. E.g.:

Can we defunct wc() function as it was deprecated for quite a long time? What do you think @cbeleites?

[GegznaV]

For now, I'll skip unit tests on wc on Windows too (already skipped on Mac).

[GegznaV]

Closed via #112 and #111

• 112

• 111