[Rivet] Unicode issue with two analysis.cc files in Rivet 2.6.0

[Klaus Rabbertz]

Dear Rivet developers,

I tried to install the latest Rivet version 2.6.0 on Ubuntu
16.04 LTS and found a little issue with make in the doc directory:

...
Using output file name 'analyses.html' and directory 'analyses'
Traceback (most recent call last):
   File "mk-analysis-html", line 201, in <module>
     page += "<kbd>" + src.replace("\n", "<br/>\n") + "</kbd>"
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 
3214: ordinal not in range(128)
Makefile:597: recipe for target 'analyses.html' failed
make[1]: *** [analyses.html] Error 1
make[1]: Leaving directory '/home/rabbertz/local/src/Rivet-2.6.0/doc'
...

The reason is non-unicode characters in two analysis .cc files from
analysis/plugin...

ATLAS_2016_I1449082.cc contains non-ASCII minus signs in these lines

75:      // Missing ET is calculated as the 4–vector sum of neutrinos 
from W/Z-boson decays. Tau decays are
77:      // way as electrons or muons, i.e. the parent is required not 
to be a hadron or quark (u − b).
151:     // A jet is a b–jet if any B–hadron is included in the jet.

CMS_2017_I1594909.cc contains a non-ASCII delta symbol

215:      // Region Njet Nb-jet HT [GeV] HTmiss [GeV] Parton 
multiplicity Heavy flavor ? ∆m

I checked with

grep --color='auto' -P -n '[^\x00-\x7F]' analysis.cc


After removing these characters the installation went fine.

Ciao,
Klaus