Add support for the Darwin Air tank pressure.
Add support for the Darwin Air tank pressure.

josh-wambua/libdivecomputer,glance-/libdivecomputer,henrik242/libdivecomputer,josh-wambua/libdivecomputer,henrik242/libdivecomputer,venkateshshukla/libdivecomputer,glance-/libdivecomputer,venkateshshukla/libdivecomputer,Poltsi/libdivecomputer-vms