localhost, apache, applications broken in testing

[Roman Brodylo <roman.brodylo@mnet-online.de>]

Hello,

I had a working system (testing, up to date) using twiki, kwiki and
drupal. 
I removed some packages marked in synaptic as "Not installed (residual
config)" and now it's broken (I suppose that was the reason).
Any attempt at reaching localhost ended without any response - empty
page and done or timeout. After twidling a bit with /etc/hosts I now get
the /var/www directory, but trying 

http://localhost/twiki gets me: "Redirecting to localhost..." and
timeout

http://localhost/kwiki says: Software error: Can't locate object method
"changes_page" via package "CGI::Kwiki::Config" at
/usr/share/perl5/CGI/Kwiki/Display.pm line 12.

http://localhost/drupal leads to: Popup message "...not possible to view
this file type... application/x-httpd-php

I guess perl is missing something, php doesn't work with apache
alltogether, and with twiki I'm lost.

I'd appreciate it if someone would give me a hint as to what's wrong,
let alone a solution. Can I reconstruct the apt changes somehow, to back
them out?

Thanks in advance,

Roman Brodylo

My /etc/apache/modules.conf:
----------------------------
ClearModuleList
AddModule mod_so.c
AddModule mod_macro.c
LoadModule config_log_module /usr/lib/apache/1.3/mod_log_config.so
LoadModule mime_magic_module /usr/lib/apache/1.3/mod_mime_magic.so
LoadModule mime_module /usr/lib/apache/1.3/mod_mime.so
LoadModule negotiation_module /usr/lib/apache/1.3/mod_negotiation.so
LoadModule status_module /usr/lib/apache/1.3/mod_status.so
LoadModule autoindex_module /usr/lib/apache/1.3/mod_autoindex.so
LoadModule dir_module /usr/lib/apache/1.3/mod_dir.so
LoadModule cgi_module /usr/lib/apache/1.3/mod_cgi.so
LoadModule userdir_module /usr/lib/apache/1.3/mod_userdir.so
LoadModule alias_module /usr/lib/apache/1.3/mod_alias.so
LoadModule rewrite_module /usr/lib/apache/1.3/mod_rewrite.so
LoadModule access_module /usr/lib/apache/1.3/mod_access.so
LoadModule auth_module /usr/lib/apache/1.3/mod_auth.so
LoadModule expires_module /usr/lib/apache/1.3/mod_expires.so
LoadModule unique_id_module /usr/lib/apache/1.3/mod_unique_id.so
LoadModule setenvif_module /usr/lib/apache/1.3/mod_setenvif.so