Add a command line option to increase the loglevel.
Add a command line option to increase the loglevel.

By default, the universal application will always log error and warning
messages, but the loglevel can be increased to also log info and debug
messages.

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