removes c11 default again and leave the choice to the user

fix: configure.ac

adds testcase to uncover a bug in ucx_array_append()

fix: missing documentation for first param in ucx_array_init_a()

adds case independent versions of sstrprefix() and sstrsuffix()

fixes hard to use documentation in string.h

(0) -300 -100 -30 -10 -6 +6 +10 +30 +100 +300 tip

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