Improve PHP CodeSniffer importer to find all rules related to a sniff

<?xml version="1.0"?>
<ruleset name="PEAR">
 <description>The PEAR coding standard.</description>

 <!-- Include some additional sniffs from the Generic standard -->
 <rule ref="Generic.Functions.FunctionCallArgumentSpacing"/>
 <rule ref="Generic.NamingConventions.UpperCaseConstantName"/>
 <rule ref="Generic.PHP.LowerCaseConstant"/>
 <rule ref="Generic.PHP.DisallowShortOpenTag"/>
 <rule ref="Generic.WhiteSpace.DisallowTabIndent"/>

 <!-- Lines can be 85 chars long, but never show errors -->
 <rule ref="Generic.Files.LineLength">
  <properties>
   <property name="lineLimit" value="85"/>
   <property name="absoluteLineLimit" value="0"/>
  </properties>
 </rule>

 <!-- Use Unix newlines -->
 <rule ref="Generic.Files.LineEndings">
  <properties>
   <property name="eolChar" value="\n"/>
  </properties>
 </rule>

 <!-- This messgae is not required as spaces are allowed for alignment -->
 <rule ref="Generic.Functions.FunctionCallArgumentSpacing.TooMuchSpaceAfterComma">
  <severity>0</severity>
 </rule>

 <!-- Use warnings for inline control structures -->
 <rule ref="Generic.ControlStructures.InlineControlStructure">
  <properties>
   <property name="error" value="false"/>
  </properties>
 </rule>

</ruleset>