* harbour/source/rtl/hbhex.c
+ added HB_HEXTOSTR() and HB_STRTOHEX() - they are compatible with
HEXTOSTR() and STRTOHEX() in xHarbour
* harbour/include/hbcompat.ch
+ added translations for HB_HEXTOSTR(), HB_STRTOHEX()
* harbour/include/hbextern.ch
+ added new functions
* harbour/contrib/libct/ctextern.ch
* updated function list