Add SA Parameters table; Fix some small bugs;

Bugs:
1. For stp_ImportDDVData , if there is no value for all variables, then raise error msg;

2. For stp_ImportBPData, modified the code to check whether the variables of one SA and their corresponding values exists in DDV or not
	- If the SA has a variable without para, but this variable or its corresponding value does not exist in DDV, then raise error msg;
	- If the SA has a variable with para, but this variable or its corresponding value cannot be found in DDV by joining the DDT table,
	   then raise error msg; (the para-value pairs are stored in @VARLIST)

3. Modified FUN_BP_VAR_EXISTS to check parameters in SA_Paras table

4. Modified FUN_DDT_DDID_EXISTS to fetch data from vw_Fixed_Weight and vw_DD_Variable_Map instead of DD_Variable_Map