rust-index: honour incoming using_general_delta in `deltachain`
It looks to be a leftover from some past, but the C index considers
only the value passed from Python whereas up to now the Rust index
was using the value of its attribute.
As a middle ground, we make this argument of `deltachain` optional from
the Python side, with the Rust implementation only defaulting to its
attribute. This way, we reduce false leads when a difference in results
is spotted.
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}