MAINT: Cleaned up mailmap

[madphysicist]

This is a followup to #8182

Ran the following commands:

sort .mailmap > .mailmap2
# Cleanup comment lines that were moved around>
mv .mailmap2 .mailmap
uniq .mailmap > .mailmap2
mv .mailmap2 .mailmap
sed 's/\(.* <.*>\) \1//' .mailmap > .mailmap2
mv .mailmap2 .mailmap

The following entries were removed:

Thomas A Caswell <tcaswell@gmail.com> Thomas A Caswell <tcaswell@bnl.gov>

Adam Ginsburg <adam.g.ginsburg@gmail.com> Adam Ginsburg <adam.g.ginsburg@gmail.com>
Alok Singhal <gandalf013@gmail.com> Alok Singhal <gandalf013@gmail.com>
Arun Persaud <apersaud@lbl.gov> Arun Persaud <apersaud@lbl.gov>
Chris Kerr <debdepba@dasganma.tk> Chris Kerr <debdepba@dasganma.tk>
Daniel <dabi@blazemail.com> Daniel <dabi@blazemail.com>
Eric Fode <ericfode@gmail.com> Eric Fode <ericfode@gmail.com>
Evgeni Burovski <evgeny.burovskiy@gmail.com> Evgeni Burovski <evgeny.burovskiy@gmail.com>
Gerrit Holl <g.holl@reading.ac.uk> Gerrit Holl <g.holl@reading.ac.uk>
Jason Grout <jason-github@creativetrax.com> Jason Grout <jason-github@creativetrax.com>
Joseph Martinot-Lagarde <contrebasse@gmail.com> Joseph Martinot-Lagarde <contrebasse@gmail.com>
Julien Lhermitte <jrmlhermitte@gmail.com> Julien Lhermitte <jrmlhermitte@gmail.com>
Ronan Lamy <ronan.lamy@gmail.com> Ronan Lamy <ronan.lamy@gmail.com>
Stephan Hoyer <shoyer@gmail.com> Stephan Hoyer <shoyer@gmail.com>

The first one is the only true duplicate.

[charris]

Looks like more can be done, but this is a good start. Thanks @madphysicist .