#16 Avoid excessive logging

[Pat Thoyts]

The current error logging setup creates enormous log
files for me when run on a Windows server. This is
because I get a lot of IIS targeted exploit code sent.
tclhttpd logs all this into the error log.

This patch restricts the amount of logged data to 160
characters. If a request exceeds this limit we log the
first and last 70 chars and replace the rest with an
elipsis.

[Pat Thoyts]

unified diff in unix format.