287: Not as small, but no table rewrites

Changes:
1. Append 'i' to the input id so it can be referenced in addition to the calculated value for a cell in the global scope. This eliminates with(t) and shaves a few bytes.
2. replace(/^=?/,"=") is the smallest way I've found yet to normalize formulas before the eval. The string issue still exists however - fixing will add some bytes back...
3. rely on the first param of A() to denote the first iteration for building the table