use $requireGroups constants in auth classes; comments; code improvements

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fix comment errors, sp. & grammar

code styling - add missing braces

Allow user info to be retrieved without groups

Some parts of dokuwiki (e.g. recent changes, old revisions) can
requests lots of user info (to provide editor names) without
requiring any group inform

Allow user info to be retrieved without groups

Some parts of dokuwiki (e.g. recent changes, old revisions) can
requests lots of user info (to provide editor names) without
requiring any group information.

This change also implements caching of user info by authmysql &
authpgsql plugins to avoid repeated querying of the DB to retrieve
the same user information.

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Restore correct public interface of getUserData() for authldap
plugin

The outer/public getUserData() implemented as a wrapper for the
previous fn which is now protected.

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added user.png for interwiki links

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avoid HTTP image screenshot urls. closes #595

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Extension manager: Fix cache extension to be .repo

The dot was missing i.e. the cache files had no real extension at all.

adjusted the office type color again

updated file icons once more

adjusted some colors, added a few common extensions for codeblocks

fixed index file

moved 16x16 icons to their original locations

for backwards compatibility

remove reference to reference from comments

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remove '&' from object parameters, PHP5 style not E_ALL

improvements in acl plugin to avoid missing var errors