data pilot enhancements

Hi,

while integrating the two data pilot enhancements into the specification 
document, I've notices two errors they unfortunately contained

1. The <table:data-pilot-source-info> element was called 
<table:data-pilot-sortinfo> in the schema. I've changed the schema to 
<table:data-pilot-sort-info> as well.

2. There were two different elements called <table:data-pilot-member>. 
One could be contained within <table:data-pilot-members>, the other 
within <table:data-pilot-group>. I've renamed the later one to 
<table:data-pilot-group-member>.

Michael