fixes return value for multiplication with zero in ucx_szmul v1.0.1

adds integer overflow checks to sstrlen and sstrcat

makes default_allocator static

adds integer overflow checks

ucx_buffere_getc should return an unsigned char (0-255) or EOF (-1)

removes man dir from clean target of doc makefile

restructures documentation + adds some examples for sstr_t

toc for examples

fixes bad header specification in root Makefile.am

web doc has now proper titles

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