Operators for numeric and string types

[GoogleCodeExporter]

Allow numeric and string operations in the right-hand-side of a boolean 
expression and comparisons with other fields.

$1 > $2

$1 > $2+$3

$2 > $1^2

$3 <= $2^$4

$5 eq $6 . "-Feature"

Original issue reported on code.google.com by wilson.freitas on 10 Jul 2012 at 12:35