Add various dive fixups, and show pressure (if any) in the plot

Now the dive profile plot *really* needs some units.  The pressure is
just a random line otherwise.

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

Makefile

@@ -1,7 +1,7 @@
 CC=gcc
 CFLAGS=-Wall -Wno-pointer-sign -g
 
-OBJS=main.o profile.o info.o divelist.o parse-xml.o save-xml.o
+OBJS=main.o dive.o profile.o info.o divelist.o parse-xml.o save-xml.o
 
 divelog: $(OBJS)
 	$(CC) $(LDLAGS) -o divelog $(OBJS) \
@@ -14,6 +14,9 @@ parse-xml.o: parse-xml.c dive.h
 save-xml.o: save-xml.c dive.h
 	$(CC) $(CFLAGS) -c save-xml.c
 
+dive.o: dive.c dive.h
+	$(CC) $(CFLAGS) -c dive.c
+
 main.o: main.c dive.h display.h
 	$(CC) $(CFLAGS) `pkg-config --cflags gtk+-2.0` -c main.c