This reverts commit de4634ec.

1 little fix

In an older version of PHP a file_exists() call would issue a warning
when the file did not exist. This was fixed in later PHP releases. Since
we require PHP 5.3 now, there's no need to supress any error here
anymore. This might even give a minor performance boost.

Added user*.less files to config

Otherwise comments are never visible in css.php

They are generated from the default ones and any additional one given
by the template. This allows to e.g. split admin styles from end user
styles in a closed wiki. You can then deliver only the user styles
using the metaheaders plugin.

This avoids treating double slashes as single line comments in CSS when
they are used in a filter or content string.

closes #638

Web path was used instead of filesystem one.

source maps are invalid for our dispatched sources and may even cause
problems. this makes sure any sourcemap declarations are stripped from
the output

for backwards compatibility

double slashes in url() always have to be ignored

The regex wasn't properly escaped here which lead to problems when the
path contains backslashes. This is the root cause of the bug reported
at https://github.com/cosmocode/edittable/issues/19

locations corrected, when those values are "url(...)".

Explanation:  In the change to the less css extension, variable
replacements now happen after the less/css files are processed
for correction of relative locations.

This reverts commit 88833bac.
and fixes FS#2874

Fix violations for the following sniff
DokuWiki.Functions.OpeningFunctionBrace

Also removed an extraneous semicolon.

This is another go at what pull request #227 tried to do. This removes
support for a style.local.ini in the template file in preference of a
style.ini in the conf folder

This now gives proper files and line numbers for errors

This makes it possible to safely overwrite ini replacements from within
any less file

still needs testing