====== UtilData::list2Dict Function ======
dict list2Dict(list data, string k='stock_id’) 
===== Description =====
change a list of dict into a dict keyed by k
===== Paramters =====
  * data list, each item of the list is a dict.
  * k string, select the k's value as new for new key in returning dict.

===== Return =====
  * dict, a new keyed by k, valued by original data.
===== Detail Information =====
<code>

list2Dict([{’name’:’zhangzhi’, ‘id’:123},{’name’:’cheungzee’, ‘id’:456}], k=’name’)
returns:
{
‘zhangzhi’:{’name’:’zhangzhi’, ‘id’:123}, 
‘cheungzee’:{’name’:’cheungzee’, ‘id’:456} 
}

</code>

===== Changelog =====
newly built, 2012-01-21