Custom author order (IEEE template) (#263)

The new yaml field is as follows:

affiliation:
  author:
    - name: First
      mark: 1
    - name: Second
      mark: 2
    - name: Third
      mark: 1
  institution:
    - name: Institution 1
      mark: 1
    - name: Institution 2
      mark: 2

This allows to separate authors of same affiliation while ordering them
by importance.

Author: DunLug

NEWS.md

@@ -1,6 +1,8 @@
 rticles 0.14
 ---------------------------------------------------------------------
 
+- Added custom author ordering for the IEEE template (thanks, @DunLug, #263).
+
 - Added a multi-line authoring option in the IEEE template (thanks, @DunLug, #264).
 
 - Added the `citation_sorting` YAML option to change the biblatex's sorting option in `ieee_article()` output (thanks, @DunLug, #265).

inst/rmarkdown/templates/ieee_article/skeleton/skeleton.Rmd

@@ -6,6 +6,17 @@ affiliation:
   institution-columnar: true  ## one column per institution (multiple autors eventually)
   # wide: true                  ## one column wide author/affiliation fields
 
+  #author:   ## A custom author ordering field that breaks institution grouping.
+  #  - name: Eldon Tyrell
+  #    mark: 4
+  #    email: eldon@starfleet-academy.star
+  #  - name: Michael Shell
+  #    mark: 1
+  #  - name: Roy Batty
+  #    mark: 4
+  #    email: roy@replicant.offworld
+  ## Authors cited in institution field are ignored when author field exists
+
   #author_multiline: ## Put authors in a given order, with multiline possibility. Authors cited in institution are ignored if exists
   #  - line:         ## Create a new author line
   #    - name: Michael Shell