Report suggested resolution limit in dials.merge

[jbeilstenedmands]

Report a suggested limit based on a fit to cc1/2=0.3, as in scaling.

Makes the output of merging stats in dials.merge consistent with dials.scale.

Useful to report the fit in merging for the dose series case, where you don't necesarily scale this subset of data individually before merging.

[codecov]

Codecov Report

Merging #2351 (503bfdb) into main (621c781) will increase coverage by 2.38%.
The diff coverage is 92.39%.

❗ Current head 503bfdb differs from pull request most recent head 90a6a4a. Consider uploading reports for the commit 90a6a4a to get more accurate results

@@            Coverage Diff             @@
##             main    #2351      +/-   ##
==========================================
+ Coverage   80.72%   83.11%   +2.38%     
==========================================
  Files         589      593       +4     
  Lines       68175    68564     +389     
  Branches     9145     9217      +72     
==========================================
+ Hits        55036    56986    +1950     
+ Misses      11031     9445    -1586     
- Partials     2108     2133      +25