Profile: add a flag to force redrawing the profile

This is needed if something has changed that requires a redraw, but the
plotDives() function can't tell (for example when a dive computer has been
deleted and there's now a different DC in the same spot, with the same
number - see next commit).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Allow the user to delete a dive computer from a dive

This can't be the only dive computer, of course. Goes nicely with the
ability to reprder them.

Fixes #551

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Have explicit "%s" format strings in printf style statements

Not having a format string that explicitly references the arguments is
considered a potential security issue in code.
This gets rid of a compiler warning that turned into an error on Fedora 21.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Fix uninitialized memory warning

It's kinda bogus, but since we add it to the Vector, we might as well
initialize all of it.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>