add one more newline before sections for readability

doc/chapter/2architecture.tex

@@ -9,6 +9,7 @@ The following assumptions are made for the implementation of the node placement
     \item Graphs are connected (maybe we will get rid of this assumption later, see~\ref{ch:progress}).
 \end{itemize}
 
+
 \section{Components}\label{sec:components}
 \TODO{write about components and dependencies}
 Figure~\ref{fig:components} contains a component diagram that illustrates this.
@@ -20,6 +21,7 @@ Figure~\ref{fig:components} contains a component diagram that illustrates this.
     \label{fig:components}
 \end{figure}
 
+
 \section{Input File Format}\label{sec:inputFileFormat}
 The input to \appname is a JSON file.
 An example is displayed in figure~\ref{fig:json-example}.
@@ -91,6 +93,7 @@ The internal representation of graphs is further explained in the section~\ref{s
     \label{fig:json-example}
 \end{figure}
 
+
 \section{Internal graph representation, \enquote{graph}}\label{sec:graph}
 One feature that is important to us, is to be able to work with hierarchical graphs (cf.\ chapter~\ref{ch:progress}).
 Therefore a node not only has edges to other nodes, but also it can contain other nodes and edges.
@@ -136,6 +139,7 @@ A class diagram of the package \enquote{graph} is displayed in figure~\ref{fig:g
     \label{table:bk-variables}
 \end{table}
 
+
 \section{The actual algorithm}\label{sec:theActualAlgorithm}
 This section expects the reader to be familiar with the node placement algorithm by Brandes and Köpf~\cite{brandes_fast_2001}.
 We recommend section 3.2.1 of Carstens~\cite{carstens_node_2012} for a detailed explanation.
@@ -166,6 +170,7 @@ This works the following:
     \label{fig:animation_and_bk}
 \end{figure}
 
+
 \section{View}\label{sec:view}
 This section only covers the software architecture regarding the views.
 For an explanation of what is actually displayed, see chapter~\ref{ch:ui}

doc/chapter/3ui.tex

@@ -47,6 +47,7 @@ Note that since the application is still under construction, so not all screensh
     \label{fig:sketch}
 \end{figure}
 
+
 \section{User interface}\label{sec:userInterface}
 Currently the only way to interact with the application is by keyboard events.
 It is planned to add both additional commands as well as some kind of graphical interface, see chapter~\ref{ch:progress}.