Better handling and diagnostics when names of expected and actual names of .log disagree.
In particular, some automatic reconfiguration when .log file is not in expected place (e.g., because $aux_dir is different to $out_dir, but TeXLive is used, so -aux-directory option for TeX engines isn't supported).
Fix problem of .bib files sometimes not being found by bibtex when latexmk runs under msys and -outputdirectory is specified.
Add use of environment variable LATEXMKRCSYS to specify system rc file.
How to install
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