Grids a-symmetric Columns#58

Please include core functionality of a-symmetric grids, like:

.columns-2-1 {2fr 1fr}
.columns-1-2 {1fr 2fr}
.columns-3-1 {3fr 1fr}
.columns-1-3 {1fr 3fr}
.columns-4-1 {4fr 1fr}
.columns-1-4 {1fr 4fr}
.columns-5-1 {5fr 1fr}
.columns-1-5 {1fr 5fr}

.columns-3-2 {3fr 2fr}
.columns-3-2 {2fr 3fr}
.columns-4-3 {4fr 3fr}
.columns-3-4 {3fr 4fr}

etc.
In both classes and selectable variables.

+1 This is vital, goes to basic design choice and usage.

Also, please ensure Advanced Themer compatability / sync, in particular with new Grid Builder inside AT (AWESOMENESS!!!)