Allow easier disabling of the tank switch and surface samples.
Allow easier disabling of the tank switch and surface samples.

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