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Avoid parsing of info files if analysis not needed

Christian Gutschow requested to merge reduced_info_file_parsing into release-3-1-x

As reported by @max.knobbe, Rivet currently parses all of the info files for every run which is an issue for large-scale MPI applications.

This change set moves the info-file parsing logic from the AnalysisInfo constructor into a separate method which in turn is only called if and when the user actually requests a given analysis.

Before:
> strace rivet LHC-8-Jets-5.hepmc.gz 2>&1 | grep "\.info" | grep open | wc -l
3066
After:
> strace rivet LHC-8-Jets-5.hepmc.gz 2>&1 | grep "\.info" | grep open | wc -l
0
> strace rivet -a MC_JETS LHC-8-Jets-5.hepmc.gz 2>&1 | grep "\.info" | grep open | wc -l
1

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