use header-only version of packedrtree; test logging (#10)

* parallel stl, release gil

* logging level
 # head: <type>(<scope>): <subject>

* ostream redirect

* logging not totally okay

* not good

* can capture

* not good

* okay

* packed rtree

* update packedrtree, header-only version

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Co-authored-by: TANG ZHIXIONG <[email protected]>

Author: district10