Debugging mod_perl with ptkdb

[John Williams <wi...@tni.com>]

I followed the advice on the mod_perl guide to try setting up remote
debugging of mod_perl with ptkdb, and I've been trying to solve the
remaining problems.

http://perl.apache.org/docs/1.0/guide/debug.html#ptkdb_and_Interactive_mod_perl_Debugging

I now have ptkdb working in Apache multi-server mode without -X (-X works
too), popping up a new ptkdb window on the remote host for each request.

This required patches to both Apache::DB and Devel::ptkdb.

Devel::ptkdb-1.1086 had a line which prevented the window from appearing
unless the filename matched $0. Since $0 is "httpd" under Apache, it never
matched.  I also added some code to emit a warning and continue running
without the window if the connection to the X server is refused.

For Apache::DB I added a new method handler for ptkdb, since the handler
turned out almost completely different from the one for the default
debugger.

Patches attached for Devel::ptkdb-1.1086 and Apache::DB-0.06.

~ John Williams