Use helper function to write decimal numbers

Never ever use '%f' to write floating point data to a file. The stupid
locale handling creates useless comma-infested output in some locales.
Instead use one of our clever helper functions to do the right thing.

Original patch by Gehad, modified by Linus to be a little more generic.

Signed-off-by: Gehad elrobey <gehadelrobey@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Add test dive that has an unused cylinder

This way one can test that the corresponding preferences option works
correctly.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Rely on ENABLE_PLANNER to enable the planner

The removal of the planner menu entry was erroneously commented out.
Other parts of the code rely on ENABLE_PLANNER to know if the planner is
enabled or not so rely on it here to.

Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>