Rename the project 'subsurface'

I never really liked 'diveclog' as a name - it's not like the C part is
all that important.  And while I could try to just make up another slang
word for despicable person (in the tradition of naming all my projects
after myself), I just can't see it.

So let's just call it "subsurface".

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

libdivecomputer.c

@@ -40,7 +40,7 @@ static void error(const char *fmt, ...)
 
 	va_start(args, fmt);
 	error = g_error_new_valist(
-		g_quark_from_string("divelog"),
+		g_quark_from_string("subsurface"),
 		DIVE_ERROR_PARSE, fmt, args);
 	va_end(args);
 	report_error(error);