Made C++/Rust search functions thread-safe. Fixed bug in rust count function

Author: kcleal

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "superintervals"
 description = "Interval overlap library"
-version = "0.3.0"
+version = "0.3.1"
 authors = ["Kez Cleal. <[email protected]>"]
 edition = "2021"
 repository = "https://github.com/kcleal/superintervals"

pyproject.toml

@@ -8,7 +8,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "superintervals"
-version = "0.3.0"
+version = "0.3.1"
 description = "Rapid interval intersections"
 dependencies = ['Cython']
 authors = [{name = "Kez Cleal", email = "[email protected]"}]