fixing traps partly as suggested by CPC1.7 rc5. Refs: #37.
The differences are
- pattern length increased to LEN(TextCmds.find.find)
- window title construction improved: replaces tabs and line feeds by
spaces and displays as much of it as possible
- display of search pattern in output window not done

Signed-off-by: Josef Templ <josef.templ@gmail.com>