rust-revlog: using the ad-hoc `NodeTree` in scmutil
Now that we have an independent `NodeTree` class able to work natively
on the pure Rust index, we use it in `mercurial.scmutil`, with automatic
invalidation after mutation of the index.
This code path is tested by `test-revisions.t` and `test-template-functions.t`
{
// 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)
}