[icap-server] New developments of icap-server

[Henrik N. <he...@he...>]

I have started to resurrect this project a little, with initial goal of
making a release that works properly on modern systems.

progress so far has been pretty good. Medusa has been upgraded, and some
minor adjustments of icap-server to match current Medusa & python
versions.

Only lightly tested so far, but seems to work. At least bannerPI RESPMOD
proxylet is confirmed working inserting it's banner as it should.

Regards
Henrik Nordström