accept factor vectors in chooseFromList; do not fail setScenario if config file has one data column

[orichters]

• chooseFromList: Don't fail if a factor vector is supplied, just convert to character. If pattern matching fails, try again.
• in setScenario, do not fail if the scenario config file contains only one single scenario column. tmp[,-1] then returns the single column only as a vector, no data.frame anymore, and everything else fails. Rather use subset to make sure it stays a data.frame. Is of relevance for https://github.com/magpiemodel/magpie/blob/develop/config/projects/scenario_config_ngfs.csv
• lock/unlock: round Sys.time() message. while I appreciate precision, this seems a bit overkill, and wasn't the case with the R version used on the old cluster.

  2024-09-03 10:03:55.11472: try to acquire model lock...
  2024-09-03 10:03:55.16457: acquired model lock in 0 secs.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 41.52%. Comparing base (e9a8b9a) to head (b4fc477). Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
R/chooseFromList.R	66.66%	2 Missing :warning:
R/setScenario.R	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #104 +/- ## ========================================== + Coverage 41.47% 41.52% +0.04% ========================================== Files 51 51 Lines 1719 1729 +10 ========================================== + Hits 713 718 +5 - Misses 1006 1011 +5 ```

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