replace double-slash comments with old-skool slash asterisk ones;
define uint16_t etc for Windows ourselves and remove ms_stdint.h &
stdint_msvc.h as no longer used;
(backend (excepting test suite) now C89 compatible)
LICENSE: move from backend to root and move COPYING to frontend, with
copies in frontend_qt & backend_qt, so in where it applies;
add LICENSE section from manual to root README
- add define "DM_DMRE 101" to zint.h as option_3 value
- add option "-dmre" to command line
- add ckeckbutton "Activate DMRE in automatic mode" to qzint
- make dmatrix.c/dmatrix.h aware of option_3 value DM_DMRE and include DMRE in automatic mode
- Use version 2.5 everywere (as already started by Robin)
- common test case for DMRE in automatic mode is numeric input data with 48 digits, which should lead to a symbol of size 8x64
