Custom logo support

(Sadly I messed up my branches when creating merge requests out of my personal modifications, so this includes my earlier PDF/A fix as well, sry for that)

Added rudimentary support for custom logos. As some labs / research groups use custom logos.

Commits #dd7b8a55 #dd7b8a55 are the relevant ones.

README.md

@@ -266,6 +266,10 @@ initial value `\texttt{\textbackslash edition}`.
 \createvariable{subseries}
 \createvariable{subseriesnumber}
 
+%% Layout, such as lab specific logos
+
+\createvariable{frontlogo} 
+
 %% Undergrad specific
 
 % faculty abbreviation, for the publication number
@@ -281,6 +285,8 @@ initial value `\texttt{\textbackslash edition}`.
 
 \createvariable{thesissubject}
 \createvariable{thesissubjectenglish}
+
+
 ```