fixes ucx_szmul definition for gcc < 5 v2.0

adds some additional avl tree tests

adds Eclipse hidden files to .hgignore

makes g++ happy again

UcxMap now separates internal non-const keys from public const keys

being more precise on the different required behavior of a destructor function for pooled and non-pooled memory

changes sstr shortcut macros s.t. they distinguish sstr_t and scstr_t + add macros which can completely disable the shortcuts

fixes logging messages starting with '- ' when no additional information is selected

removes deprecated ucx_list_append_once() and ucx_list_prepend_once()

Tags finalization of the scstr_t integration.

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