Fixes for issues discovered while running one oracle

[greenhat]

• Close Consequent publish data point operation return "double spending" node error #121
• Close RefreshAction failed with error: refresh box not found #127
• Close Refresh action with not enough data point throws fatal error #128

[coveralls]

Pull Request Test Coverage Report for Build 3180054659

• 21 of 78 (26.92%) changed or added relevant lines in 8 files are covered.
• 9 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.2%) to 70.911%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/src/pool_commands/refresh.rs	0	5	0.0%
core/src/state.rs	0	6	0.0%
core/src/actions.rs	0	11	0.0%
core/src/oracle_state.rs	0	13	0.0%
core/src/main.rs	0	22	0.0%

Files with Coverage Reduction	New Missed Lines	%
core/src/api.rs	1	0%
core/src/main.rs	1	0%
core/src/actions.rs	2	0%
core/src/oracle_state.rs	5	0%

Totals
Change from base Build 3149575678:	-0.2%
Covered Lines:	2445
Relevant Lines:	3448

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💛 - Coveralls

[greenhat]

This is exactly the kind of error I wanted to eliminate when I made #47

[kettlebell]

Looks great! Just a small typo to fix.

[kettlebell]

Great thanks!