use verbosity instead of iverbosity in PH and EPW calculation

[unkcpz]

Fix #606

The iverbosity is obsolete and found causing ph.x failed in qe-6.6.

[sphuber]

Do you know when iverbosity was deprecated and removed, and especially in what version of QE verbosity was added? This is important because we need to know if this change would essentially be dropping support for certain QE versions. Also, I just checked that we also still use iverbosity in the PwCalculation and CpCalculation plugins, but I no longer find that option in the documentation of QE v6.3 or later.

[unkcpz]

Do you know when iverbosity was deprecated and removed, and especially in what version of QE verbosity was added?

I did a quick search and can't find the details. I guess the answer will in the source code anyway, I will make more investigate.

[atztogo]

I hit this issue at qe-6.7.
I found information on PH:
https://github.com/QEF/q-e/blob/626d07a1cff06525d08d931a12672b28717f9932/Doc/release-notes#L869

[sphuber]

did a quick search and can't find the details. I guess the answer will in the source code anyway, I will make more investigate.

I ran through the source code and it seems it was changed in commit a7ef3557fb946e6c226aaa4c96b1fabed0e12346 of the QE source code, which was released with v5.2. I think that version is old enough that we can simply replace the value here and no longer support the old flag. The documentation at that time that contains a reference to the commit: https://gitlab.com/QEF/q-e/-/blob/qe-5.2.0/PHonon/Doc/INPUT_PH.def

[sphuber]

Thanks @unkcpz

[atztogo]

Thanks @unkcpz and @sphuber.