installer 44.6

· added visual effect (effect: custom screen with colored backfill hook)

· added support for datatypes (showmedia,setmedia,closemedia)

· added backtracemechanism (trace, retrace, back parameter)

· added close gadget for script abort

· "Back" button replaces "Abort Install..." button if backtrace mechanism
is acitve.

· increased buffer size for string concatenation and format


installer 44.7 (7.8.99)

· askdir had no "Back" button

· askfile's "Back" button didn't work at all

· askoptions and askchoice did not reset the gadgets if "Back" button was 
pressed so the script crashed in most cases

· changed documentation for backtrace mechanism: it should only be used for
information retreival.

· some scripts used confirm parameter wrong (parameter was expected to be
a string not integer) which results in enforcer hits instead of error
message. Now it accepts a string ("expert") or an integer (like (user)
command).

· Added reboot statement. It is not executed in pretend mode.

· Added workbench object control (openwbobject, showwbobject, closewbobject).

· Extended documentation

installer 44.8 (28.9.99)

· copy_files is not longer aborted if one file copy fails and option force is
  used.

installer 44.9 (29.9.99)

· some internal project changes

installer 44.10 (1.10.99)

· added automatic stack extension on startup (10000 bytes).