[doc] INSTALL missing some info

[Ralf Lang]

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> pear install pear/net_pop3
Hardly a necessity if you want to use imap.

> pear channel-discover pear.symfony.com
Only really needed by Horde_Test if you want to run PHPUnit

> Please take my message as a way to improve the docs, and please
> don't assume that everybody knows the inner workings of PEAR

Which should normally not be needed.


- -- 
Ralf Lang
Linux Consultant / Developer
Tel.: +49-170-6381563
Mail: lang at b1-systems.de
B1 Systems GmbH
Osterfeldstra￟e 7 / 85088 Vohburg / http://www.b1-systems.de
GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537
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