Replaced tabs with spaces. Removed unneeded TTI include in utilities
GitHub #12: Fix MSVC14 warning C4456: declaration of 'x_parent_right' hides previous local declaration
Removed warning about unused arguments
Use intrusive utilities instead of boost utilities to limit dependencies.
Backport changes to 1.56 as some of them are needed to avoid a broken release on 1.56.
Removed unneeded include and operator.
Corrected documentation for "reference".
Reimplemented remove family for lists using new stable_partition algorithm. This allows less code duplication between lists with different options (constant_time_size, cache_list, safe/non-safe hooks, etc.).
Merge branch 'develop' into node-checkers
don't use extra space for rbtree checkers