add optimized implementation of insert_sorted for array lists

fix cx_ll_insert_sorted_cmp_func not being thread local

implement optimized sorted insert for linked lists - resolves #415

fix typo in documentation

optimize default insert_sorted implementation

add stupid default implementation for high level insertion sort

add default impl for some list member functions

fix inserting via iterator correctly increases element count

close feature branch feature/tree_add

merge feature/tree_add branch

(0) -300 -100 -10 +10 +100 tip

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