Removed FoodDbItem because FoodItems with the same tableName and Id but different weights refer to the same FoodDbItem. Just use the FoodItem directly as the HashMap key.
Meal fragment now also supports search, so we don't need to hide the search text field in that tab.
Now supports clearing of all MyFoods.
Reorganized code into main, myfoods, common sub-folders.
Added ability to export MyFoods in csv format.