Fixed AR-1321: Allow '&' in filename

The following filename is valid now: "x ¬ £ % & + ; x.txt"
This was a restriction imposed by WebDAV, but the encoding of the repsonses is working well and these restrictions be removed as a result.

Fixed AR-1281: WebDAV upload was assigning incorrect encoding

I added a bean 'charset.finder', which can be fetched from the MimetypeService.
Various pluggins now exist to decode a stream and figure out what the encoding is.
WebDAV and CIFS/FTP are now hooked into this so that they guess a little better.

Fixed others:
Added retrying transactions to WebDAV.
Read/write transactions for WebDAV.


git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@6073 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

config/alfresco/model/contentModel.xml

@@ -16,7 +16,7 @@
 
    <constraints>
       <constraint name="cm:filename" type="REGEX">
-         <parameter name="expression"><value><![CDATA[(.*[\"\*\\\>\<\?\/\:\|\xA3\xAC\%\&\+\;]+.*)|(.*[\.]?.*[\.]+$)|(.*[ ]+$)]]></value></parameter>
+         <parameter name="expression"><value><![CDATA[(.*[\"\*\\\>\<\?\/\:\|]+.*)|(.*[\.]?.*[\.]+$)|(.*[ ]+$)]]></value></parameter>
          <parameter name="requiresMatch"><value>false</value></parameter>
       </constraint>
       <constraint name="cm:userNameConstraint" type="org.alfresco.repo.dictionary.constraint.UserNameConstraint" />