make food database optional (enable=food)

[MilosKozak]

No description provided.

[codecov-io]

Current coverage is 78.69%

Merging #1323 into dev-0.9 will decrease coverage by -0.02% as of 8d2675a

@@            dev-0.9   #1323   diff @@
=======================================
  Files            84      84       
  Stmts          6952    6953     +1
  Branches          0       0       
  Methods           0       0       
=======================================
  Hit            5472    5472       
  Partial           0       0       
- Missed         1480    1481     +1

Review entire Coverage Diff as of 8d2675a

---

Uncovered Suggestions

1. +0.32% via .../client/boluscalc.js#151...172
2. +0.26% via .../client/boluscalc.js#250...267
3. +0.25% via .../client/boluscalc.js#664...680
4. See 7 more...

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