Also strip out characters less than !

That's SPACE and non-printing characters.  As requested by adehnert.
Added a logadmin variable for logging admin messages
Revert "Added a logadmin variable for logging admin messages"

This reverts commit 639d6144da1326ca4d0465617110729aa98296d3.

There are problems with logging the splash message, because it displays
before all of the perl config is set up.