tinkering with expnode for the statement list
added code for the parsing of call statement
added code for the parsing of formal parameters in a procedure
added code for the parsing result type in a procedure
added code for the parsing the return statement
added code for the parsing of the function call
corrected scope of parameters
found a connection b/w parameters and procedures using procedureType
able to add paramters to local scope of a procedure, adding it in static checker
added code to check for duplicate parameter/local var decleration
checking for the same no of formal and actual parameters done
checking if formal and actual paramters are of the same base type done