- Ensure to disable chunk-wise processing for all peaksData calls by passing
  parameter f = factor().

- Add the `filterMsLevel` methods for `MsExperiment` and `XcmsExperiment`.

- Split the PeakGroups alignment function to enable alignment using a predefined
  peak matrix.

- Fix issue #702 to ensure peakGroups subset-based alignment correctly uses the
  `minFraction` parameter.
- Split the code for peakGroups-based alignment to enable alignment using
  externally defined retention time matrix of anchor peaks.

- Ensure the "ms_level" column in the `chromPeaksData` is of type `integer` to
  avoid obscure validity errors on extracted `Chromatogram` objects (happening
  randomly).

- Support alignment with the peakGroups method using a predefined anchor matrix.

- `.match_last` was returning a wrong result if used with `nomatch = -1`. This
  affected removing or adding elements to the processHistory during xcms
  preprocessing.

- Throw an error for `adjustRtime` if alignment results are already present.