ZHL16 switches to deco gases between levels

[eskil]

Given a plan ala;

120 fsw, air @ 1.2
100 fsw, air @ 1.2

and a OC deco gas

EAN32 from 110 fsw

th resulting plan switches to EAN32 between the two levels, instead of after the second level. Using VPM/B, this does not happen, except if there's deco between the levels, see ticket#19.

Here's the entire plan ;

Dive Plan : Dives
Plan Settings
Algorithm	zhl16b gf-low=0.20 gf-high=0.85
Units	imperial
OC Switch Time	00:01:00
SetPoint Switch Time	00:01:05
Diluent Switch Time	00:01:00
Ascent Rates In Deco	no
Add Short Stop	yes
END Method	N2 + He + O2
Dive #1:
Levels
Depth	Time	Mix
120	16	air @ 1.2
100	5	air @ 1.2
Deco gases
Mix	Usage	Depth
EAN32	OC	110
Settings
Descent Rate	90 fsw/min
Ascent Rate	30 fsw/min
Last Stop	20 fsw
Stop Interval	10 fsw
Bottom RMV	0.7 cuft/min
Deco RMV	0.6 cuft/min
CCR Bottom MOR	1.1 L/min
CCR Deco RMV	1.0 L/min
Consumption
Volume	Mix
0.9 cuft	CCR O2
23.3 cuft	EAN32
Plan
Action	Depth	Time	Runtime	Mix	CNS	ppO2	ppN2	ppHe	EAD/END	GF	
0	air @ 1.2 [oxygen]	+0 = 0	1.00	0.00	0.00	0 / 0		
Descend	120		2	air @ 1.2 [EAN26]						
Level	120	14	16	air @ 1.2 [EAN26]	+7 = 8	1.20	3.49	0.00	111 / 120		
Ascend	110		17	air @ 1.2 [EAN27]						
18	EAN32	+1 = 9	1.40	2.98	0.00	90 / 110		
Deco	110	1	19	EAN32	+1 = 10	1.40	2.98	0.00	90 / 110	0.20	
Ascend	100		19	EAN32						
20	air @ 1.2 [EAN29]	+0 = 11	1.20	2.87	0.00	86 / 100		
Level	100	6	26	air @ 1.2 [EAN29]	+3 = 13	1.20	2.87	0.00	86 / 100		
Offgassing	61		26	air @ 1.2 [EAN29]						
27	EAN32	+1 = 14	1.30	2.77	0.00	82 / 100		
Ascend	30		30	EAN32						
Deco	30	0	30	EAN32	+0 = 15	0.61	1.31	0.00	21 / 30	0.67	
Ascend	20		30	EAN32						
Deco	20	8	38	EAN32	+1 = 16	0.52	1.10	0.00	13 / 20	0.73	
Ascend	0		38	EAN32						
Surface			38	EAN32						
Time To ...
Time To Clear	sealevel	07:45 hours
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