Merge branch 'update_version_number' into 'master'

version 2.3.0

Merge branch 'update_changelogs' into 'master'

update author's list

document removal of deprecated classes in changelog

remove deprecated typedef for `optional`

add photon + jets support and executive summary to changelog

(HEJC) fix code for merging configurations

add new event filtering to changelog

update Sherpa link

remove deprecated `EmptyAnalysis` class

Add deprecation warnings for `require lot pt jet` and `analysis jet pt`

update documentation

udpate tests

fix bug in new `to_AndSelector`

update example config

allow singular in YAML jet selector settings

make new `AndSelector` copyable

unify selectors for low pt and high pt jets

use new input selectors for low pt and analysis jet settings

add require YAML setting

add classes for event selection

(HEJC) update documentation

update table of supported configurations to include NLL photon + jets…

Merge branch 'photon_jets_cenqqx' into 'master'

remove tab

fix date and spaces

Merge branch 'photon_jets_NLL' into 'master'

(HEJC) support Sherpa particle containers in process final state

(HEJC) add example for `low pt fraction` option

(HEJC) fix extraction of new `low pt fraction` setting

(HEJC) add option to set minimum pt in low pt runs

(HEJC) fix bug in parsing number ranges

(HEJC) remove unused member

(HEJC) make number of events in low pt runs tunable

(HEJC) change `--runs` option to indicate the individual run numbers instead of…

(HEJC) fix argument ranges in examples

(HEJC) add selector to make Sherpa always generate low pt events in low pt runs

ensure numerically exact rapidity conservation after reshuffling

Merge branch '226-wrong-size-of-virtual-corrections-returned-when-using-nlo…

Merge branch '225-hejc-does-not-restrict-sherpa-to-qcd' into 'master'

fix virtual corrections for processes with interference when NLO truncation is…

add NLO truncated xs tests

Merge branch '223-expire-_all_-artefacts-sooner' into 'master'

(HEJC) slightly simplify function to count electroweak couplings

(HEJC) add EW order to Sherpa output

[.gitlab-ci.yml] Expire all artefacts after a 1 week

add photon + jets cross section regression test

add reference classifcation test for photon + jets

Merge branch 'photon_jets' into 'master'

bug fix: coupling normalisation

bug fix: photon search

document support for photon + jets

bug fix: photon current

add classification for photon + jets

add photon + jets matrix element

Merge branch '208-cmake-cannot-find-yaml-cpp-target-2' into 'master'

set yaml-cpp target name depending on what is found

backwards compatibility: only try to set policy if it is known

Merge branch '207-new-cmake-versions-ignore-packagename-_root' into 'master'

Merge branch '172-generate-input-files' into 'master'

re-enable `<PackageName>_ROOT` variables in recent cmake versions

(HEJC) fix typo

(HEJC) rename example event file to not overrun line length limit in readme

(HEJC) small fixes to H+jets example readme

(HEJC) bug fix: fixed inconsistent YAML entry name

(HEJC) fix analysis settings in H+jets Sherpa2NLO configuration

(HEJC) remove superfluous deep copy

(HEJC) enable optimisations in H+jets example code

(HEJC) bug fix: remove HEJ entry from final generator options

(HEJC) added small program to fix Sherpa output

(HEJC) example for H+jets

(HEJC) Ensure HEJ gets normalisation right for `ensure_jets` output

(HEJC) small restructuring of YAML input

(HEJC) fix typo in example

(HEJC) document use of `--copy-dir` to copy integration grids

(HEJC) update example

(HEJC) major rewrite: write a separate HEJ config file for each…

(HEJC) update documentation

(HEJC) support for tags in Sherpa config files

(HEJC) change input format: replaced sequence keys by new `generators`…

(HEJC) make `copy-dir` option optional

(HEJC) support specific HEJ configurations for selected multiplicities

(HEJC) fix bug(?) parsing empty list of multiple command line options