Many changes and adding examples

- Fix use of sizes (maybe set exception for 13pt?)
- Prepare keys for margins
- Show example of bibfile modification on the go
- Show how to use `\xkvview` to check defined keys

York-Thesis/mypreamble.tex

@@ -87,6 +87,7 @@
 %%% ===== Bibliography setup
 \usepackage[eprint,          % Include information for pre-prints.
             doi=false,
+            eprint=true,
             url=false,
             maxnames=10,     % Truncate lists of more than 10 authors.
             giveninits=true, % Only output the initials of an author's given
@@ -97,7 +98,15 @@
            ]{biblatex}
 \addbibresource{\subfix{Bibfiles/firstbib.bib}}
 
-
+\DeclareSourcemap{
+  \maps[datatype=bibtex]{
+    \map{
+      \pertype{article}
+      \step[fieldsource=arXivId, fieldtarget=eprint, final]
+      \step[fieldset=archiveprefix, fieldvalue={arXiv}]
+    }
+  }
+}
 
 %%% ===== Styling for my theorems
 \theoremstyle{plain} % the style for theorem, propositions and lemmas