Category reorder is confused by identical or negative values

[erlend_sh (Erlend Sogge Heggen)]

The new visual category reordering UI currently allows some bad user inputs:

[sam (Sam Saffron)]

My call here is, nuke the numbers, add drag and drop, always re sequence

@codinghorror @riking

[codinghorror (Jeff Atwood)]

Sure, I support that – @sam is the category reordering expert, whatever is easy is best.