use new string formatting macros in documentation

bring back CX_PRIstr and CX_SFMT macros - resolves #612

fixes unnecessary allocations in cx_strcat() family of functions

add cxTreeSize() - resolves #624

add test and documentation for cxListContains() - fixes #643

adds cxListContains() implementation (still needs test and docu)

add windows support for new buffer auto-extend strategy - relates to #641

(0) -1000 -300 -100 -30 -10 -7 +7 tip

mercurial