XML table override keys and variables

*Title: XML table override keys and variables

*Documentation:
There has been added a new override key for use with the XML 
table tag and it's sub tags. You can now override all sub tags
of table by using the override key "table_classification".

Two extra template variables are added: col_count and row_count. 
Both tags are available in th, and td tags while only row_count is
available in tr tags.

Example:
To override every td in tables which has set the classification 
"timetable" use the following override settings:

[timetable_cell]
Source=content/datatype/view/ezxmltags/td.tpl
MatchFile=datatype/ezxmltext/timetable_cell.tpl
Subdir=templates
Match[table_classification]=timetable

Notice that the match is table_classification and not 
classification like normal. The reason for this is that you can
have a specific classification for the table cells also.