Added loads of units in nearly all graphs.

Overhauled fig_invariance_full.pdf.
Added some legends, somewhere.

python/fig_invariance_short.py

@@ -154,10 +154,10 @@ xlabels = dict(
     big='scale $\\alpha$',
 )
 ylabels = dict(
-    filt='$x_{\\text{filt}}$',
-    env='$x_{\\text{env}}$',
-    inv='$x_{\\text{adapt}}$',
-    conv='$c_i$',
+    filt='$x_{\\text{filt}}$\n$[\\text{a.u.}]$',
+    env='$x_{\\text{env}}$\n$[\\text{a.u.}]$',
+    inv='$x_{\\text{adapt}}$\n$[\\text{dB}]$',
+    conv='$c_i$\n$[\\text{dB}]$',
     feat='$f_i$',
     big=['measure', 'rel. measure', 'norm. measure']
 )