BaseMin and Varmin should be uint

[nitika-goel]

The variables BaseMin and Varmin should be uint256 instead of uint64 and should store values with decimals, for eg if BaseMin = 6 ETH it should be saved as 6*10^18.
This also leads to incorrect comparison and triggers in functions like internalLiquiditySwap, where Base Min + Var Min is compared to CA Balance directly, even though Base Min is saved without decimals and CA balance is retrieved with decimals.

[nervehammer]

changes done, please refer 2dde656

[nitika-goel]

There are places where they are still referred as uint64, for example in function sendClaimPayout we are converting the parameter to changeCurrencyAssetVarMin() as uint64, while the parameter requires uint256.

[nervehammer]

changes are done. I am converting all non uint256 types to uint256 as breaking uint256 to smaller uints consume gas if they are not packed. e.g sum assured is not in 10^18, cover period is uint16 etc.