merges closed feature/array branch v2.1

closes array branch towards ucx 2.1 release feature/array

adds changelog to html documentation

fix: missing test header files in make dist target

fixes build on FreeBSD and macOS

fixes string replace function in case replmax is 0

adds more sstrreplace tests

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

mercurial