Inserted comment about reversing argument ordering for qqxf

Rewrote `ME_W_qqxmid_current` in a much smarter way.

Removed unnecessary if(bool) statements from ME_W_qqxf/b_current

Removed superfluous functions

Assign pq/pqbar in a smarter way to allow const.

Added comment about calling in reverse ordering for unof in Pure Jets.

Merge branch 'master' of gitlab.dur.scotgrid.ac.uk:hej/HEJ into tensor-cleanup

FKL most likely, check for that first. Throw error if process type not…

Merge branch 'tensor-cleanup' into 'master'

Merge branch 'master' of gitlab.dur.scotgrid.ac.uk:hej/HEJ into CombineUnobUnof

Merge branch 'gauge_invariant_Wuno' into 'master'

Typo in runcard.

Merge branch 'check_colour' into 'master'

Merge branch 'clean_jets' into 'master'

Merge branch 'lhef_order' into 'master'

Merge branch 'process_id_hepmc2' into 'master'

Typo

Merge branch 'more_markdown' into 'master'

Merge branch 'fix_virtual_W' into 'master'

Currents for Pure Jets Exqqx implemented

Added Matrix Element Calls (PureExQQx)

Added function declarations for Pure ExQQx

Added Iterator which allows calls of qqxb and qqxf (Pure)

Removed dead code + added missing doxygen declaration

Added calls for ExQQx forward and backwards

Added reference to the Extremal qqbar Pure Jets in dev manual

Moved assert one function up to avoid Unused parameter compiler warning.

Merge branch '91-fkl-impact-factor-below-jet-cut' into 'master'

Added Extremal qqbar (Pure Jets) reference to Change Log

Added Subleading ME test for Pure Jets. FAILS. (Negative Energy, nan)

Port Old Currents Across

Remove Dead code + Correct Indentation

Merge branch '93-classification-allows-not-implemented-processes' into 'master'

Updated CI test for Pure Subleading.

Remove Unused `void j()` function

Remove dependence on void j()

Fix: j() not the same as joi()

Cut down long lines (To pass `No_Tabs` test)

Merge branch 'master' of gitlab.dur.scotgrid.ac.uk:hej/HEJ into PureExqqx

Updated Classify tests to reflect Extremal qqx in Pure.

ExtremalQQx now claassified as "resummable" for Pure Jets

Prefer `std::abs()` over `abs()`

Protect joi/joo from negative energies introduced by crossing.

Indentation

Lesson: `std::abs()` much better behaved than `abs()` using `abs` on eg `pout.

Remove superfluous if's. Variables const where possible

More const by use of `()?():()` operator.

Merge branch '92-use-jet-pt-fraction-in-event-classification' into 'master'

Merge branch 'master' of gitlab.dur.scotgrid.ac.uk:hej/HEJ into CrossUnoPure…

Removed dead code

Removed TODO. Indentations

Fix: CAM Factor removed. See HEJ_Explorer commit: hej_explorer@d2110e23.

Updated CI test after bug fix

Remove unnecessary bool, use const.

Todos, visuals and prefer `++x` to `x++`

Remove superfluous code

Use `HEJ::metric()`. Reduce for loops. Visuals. More const.

Improve efficiency of ExQQx calc (less nested for loops)

C++11 Initialisation. Visuals. Remove unnecessary argument

Removed colour factor of "1/4(N_C^2-1)" from explicit ME calc (and update CI…

remove unnecessary variables in calc of `void eps()`

Utilise Anonymous Namespace

utilise standard library

Add XS test for Pure Extremal qqx

Line Length + Header Declaration

Remove Dead Code

Anonymous namespace + Identations

ME copied from HEJ1

Added `ME_qqxmid_current()` function which calls HEJ ME

Added `tree_kin_jets_qqxmid` which calls ME_qqxmid..` level function

Central QQX Implemented. Update Classification tests

Removed Unused variables. (Compiler warnings)

Added call for CentralQQx in Pure Jets

Remove Tabs

Add regression test for PureCenQQx XS

Use `HEJ::metric()`

Additional placeholder ME tests for Pure Jet CentralQQx.

Use const where possible in current impl

Perform contractions. Reduce nested for loops from 4->2

use `c++11` list initialisation

Prefer `++x` to `x++`

Updated confusing caption

Merge branch 'PureCentralQQX' into 'master'

Merge branch 'fix_weighted_sherpa' into 'master'

Merge branch 'current_doc' into 'master'

Merge branch '109-w-jets-subleading-me-tests' into 'master'

Use `is_quark()` and `is_antiquark()` functions

Merge branch 'cleanup_me' into 'master'

Merge branch '115-subleading-me-tests-in-pure-jets-nan-values' into 'master'

Merge branch 'current_generator_W_extremal_qqbar' into 'master'

better choice of auxiliary vector in W + extremal qqbar current contraction

simplified code for jWuno contraction

fixed documented formula for jW

fixed documentation

small cleanup in W+jets with central qqbar

code to generate contraction of W current + central qqbar + FKL current

use generated code for W current + central qqbar + current contraction

bug fix: sign in split_into_lightlike

documentation of central qqbar vertex parts

Merge branch 'current_generator_W_central_qqbar' into 'master'