Remove displacement plotting, and ifo argument, from plot_noise

This is ultimately to remove assumptions about what is being plotted from
the plotting function.

README.md

@@ -19,7 +19,7 @@ description is loaded, the noise budget can be calculated and plotted:
 >>> ifo = gwinc.load_ifo('aLIGO')
 >>> ifo = gwinc.precompIFO(freq, ifo)
 >>> noises = gwinc.noise_calc(freq, ifo)
->>> gwinc.plot_noise(ifo, noises)
+>>> gwinc.plot_noise(noises)
 ```
 Or the `gwinc` convenience function can be used to handle it all:
 ```

gwinc/__main__.py

@@ -64,8 +64,6 @@ parser.add_argument('--title', '-t',
                     help="plot title")
 parser.add_argument('--fom',
                     help="calculate inspiral range for resultant spectrum ('func[:param=val,param=val]')")
-parser.add_argument('--no-displacement', '-nd', action='store_false', dest='displacement',
-                   help="suppress displacement sensitivity axis")
 group = parser.add_mutually_exclusive_group()
 group.add_argument('--interactive', '-i', action='store_true',
                    help="interactive plot with interactive shell")
@@ -214,7 +212,7 @@ You may interact with plot using "plt." methods, e.g.:
 >>> plt.savefig("foo.pdf")
 ''')
         ipshell.enable_pylab()
-        ipshell.run_code("plot_noise(ifo, noises)")
+        ipshell.run_code("plot_noise(noises)")
         ipshell.run_code("plt.title('{}')".format(title))
         ipshell()
 
@@ -224,10 +222,8 @@ You may interact with plot using "plt." methods, e.g.:
         fig = plt.figure()
         ax = fig.add_subplot(1, 1, 1)
         plot_noise(
-            ifo,
             noises,
             ax=ax,
-            displacement=args.displacement,
         )
         ax.set_title(title)
         fig.tight_layout()

gwinc/plot.py

@@ -74,16 +74,12 @@ STYLE_MAP = {
 
 
 def plot_noise(
-        ifo,
         noises,
         ax=None,
-        displacement=True,
 ):
     """Plot a GWINC noise budget from calculated noises
 
     If an axis handle is provided it will be used for the plot.
-    `displacement` may be set to False to supress the right had
-    displacement axis.
 
     Returns the figure handle used.
 
@@ -141,11 +137,4 @@ def plot_noise(
     ax.set_xlim([min(f), max(f)])
     ax.set_ylim([3e-25, 1e-21])
 
-    if displacement:
-        ax_d = ax.twinx()
-        ax_d.set_yscale('log')
-        y1, y2 = ax.get_ylim()
-        ax_d.set_ylim(y1*ifo.Infrastructure.Length, y2*ifo.Infrastructure.Length)
-        ax_d.set_ylabel(u"Displacement [m/\u221AHz]")
-
     return fig