Add fname to plot_network to specify output filename.

plot_network() is used to plot various types of networks. However, the name of the produced html-file was hard-coded to "citation.html". This change introduces a fname-parameter, that allows to specify other file-names. It defaults to "citation.html" to keep compability with previous versions.

Author: larsgrobe

litstudy/network.py

@@ -40,7 +40,8 @@ def plot_network(
  controls=False,
  scale=1,
  iterations=1000,
- gravity=1
+ gravity=1,
+ fname='citation.html'
 ):
  """Plot a `networkx.Graph` generated by one of the `build_X_graph`
  functions in this module. Plotting is done using the `pyvis` library.
@@ -152,7 +153,7 @@ def plot_network(
  )
  )
 
- return v.show("citation.html")
+ return v.show(fname)
 
 
 def build_base_network(