adds ucx_avl_free_content() function and documentation in modules.md

adds distance functions for integers as utils

adds ucx_longintcmp() compare function

introduces macro for library version, s.t. both version numbers can be changed in configure.ac

adds more convenience macros for sstr

minor formatting fix in modules.md

doc: adds ucx_sprintf() and ucx_bprintf() samples + fixes leftmenu

removes artificial anchors from modules.md

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