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This example tests the use of ph.x to calculate a part of the dynamical matrix.
The calculation proceeds as follows:
1) make a self-consistent calculation for CH4 at the Gamma point
(input=ch4.scf.in, output=ch4.scf.out).
2) make a phonon calculation at the Gamma point and calculate all the modes
just for comparison.
(input=ch4.phG.in, output=ch4.phG.out).
3) make a phonon calculation at the Gamma point and calculate only the mode
with A1 symmetry.
(input=ch4.phA1.in, output=ch4.phA1.out).
4) make a phonon calculation at the Gamma point and calculate only the
modes with E symmetry.
(input=ch4.phE.in1, output=ch4.phE.out1).
5) recover previous calculation and finish the E mode.
(input=ch4.phE.in2, output=ch4.phE.out2).
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