Logger: setters return old value, coerce all msg components to string before concatenating

[infotroph]

Description

Setters return old value

logger.set*(op) now invisibly returns the value of op that was in effect before the call, for ease of undoing temporary changes by the same pattern you might know from op <- options(...); on.exit(options(op)). I found I was wanting this to keep state clean during testing.

More robust string conversion

Cases where the message is composed from objects of mixed type now convert each argument to a string before concatenating them.

Before:

> logger.info("dates were", as.Date(c("2024-01-01", "2025-01-23")))
2025-08-06 02:19:58.225157 INFO   [console] : 
   dates were 19723 20111 

After:

> logger.info("dates were", as.Date(c("2024-01-01", "2025-01-23")))'
2025-08-06 02:09:12.461013 INFO   [console] : 
   dates were 2024-01-01, 2025-01-23

Also

• whitespace cleanup
• couple minor Roxygen wording tweaks

Motivation and Context

Review Time Estimate

• Immediately
• Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• My name is in the list of CITATION.cff
• I agree that PEcAn Project may distribute my contribution under any or all of
  • the same license as the existing code,
  • and/or the BSD 3-clause license.
• I have updated the CHANGELOG.md.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[dlebauer]

LGTM

TOOD: either merge documentation suggestions in infotroph#11 or let me know and I can point it to develop.

[dlebauer]

👍🏻