[horde] New install fails in multiple ways - particularly class pear and IMAP

[Iain Stevenson]

I seem to be having a lot of trouble getting a clean install of the latest 
Horde going.  I've installed Horde + Kronolith + Gollem + Mnemo + Turba + 
Trean.

A lot of the time I'm getting 'Undefined class name 'pear' messages from 
just about any application.  What causes this?

IMAP authentication seems to fail because it always tries to use SSL and 
the novalidate cert option seems not to do anything.  I'm running Cyrus 
IMAP.

I also found the PHP APC accelerator threw lot of out of shared memory 
errors so I disabled that.

I ran into real problems with an earlier version of Horde and gave up on 
it.  I like the web based install but too many things seem just not to 
work.  I've run all the tests and the php install is OK.  I'd accept that 
not all the PEAR stuff may be up to date.

  Iain