adding missing pi test

kat_test/random/pi_manual.kat

+l l1 3530 0 n1 # power so that there is 1MW in the cavity
+tem l1 0 0 0 0
+tem l1 1 1 1 0
+m m1 0.986 0.014 0 n1 n2
+s s1 3994.5 n2 n3
+m m2 0.99999 1e-5 0 n3 n4
+cav c1 m1 n2 m2 n3
+attr m1 Rc -1934
+attr m2 Rc 2245
+tf tf1 1 0 p 30k 1E7
+smotion m2 surf_mod.map tf1
+
+ 
+pgaind R m2 s0
+yaxis re
+# To plot the sidebands in the cavity
+# uncomment these and remove oltfd above
+#ad upper 1 1 $fs n2
+#ad lower 1 1 $mfs n2
+#yaxis abs
+fsig l_sig l1 1 0 1
+# The aim is scan the resonance frequency of the motion
+# to see which might become unstable.
+put tf1 fp1 $x1
+xaxis l_sig f lin 20e3 50e3 1000
+maxtem 2
+
+gnuterm no
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