[5.4] Adding tinyIncrements database schema method

[KristofMorva]

I have just met this problem, there is every size of increments, except tinyIncrements, which can be useful for smaller datasets, like currencies (<200 exists).

[joshmanders]

Just an FYI @KristofMorva if you edit your PR, you can change the branch it merges into by clicking the Edit button. (like you would for editing the title)

[KristofMorva]

@joshmanders ah, thank you, but in the last PR I have actually created the new branch itself on the wrong base, which I couldn't fix.