R v 4.3.0: vectors in `if`, `&&` or `||` give an error

[alko989]

It happens at least in the manage function where it checks for the fractiles. Affects everyone using R >= 4.3.0

Background:
In R version 4.3.0, if, && and || do not allow for vectors anymore - used to be a warning.

Calling && or || with LHS or (if evaluated) RHS of length greater than one is now always an error, with a report of the form

'length = 4' in coercion to 'logical(1)' 

Environment variable R_CHECK_LENGTH_1_LOGIC2 no longer has any effect.