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Fixedwing porpoising effect in altitude hold modes #10305

@rts18

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@rts18

I ran tests using 8.0 from the master. And encountered a porpoising or dolphin effect in all modes that hold altitude.
I proceeded to run auto level trim and altered pitch2throttle related settings, showing no difference. I did not expect anything to change, as this aircraft was already tuned with 7.1.2.
I later reduced nav_fw_pos_z_p = 29 and increased nav_fw_pos_z_i = 8. This appears to have removed the effect. However it does not appear to track altitude as well as the previous release.
It reaches the target altitude and slows down correctly with the adjustment of an apparent new setting nav_fw_alt_control_response. However there is more drift either side of the setpoint altitude, than while using 7.1.2.

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