Reorganized tests for sequences
Added test for 'len' unary operator
Added test for generation of 'hd' unary expression
Added test for generation of 'tl' unary expression
Added test for generation of 'elems' unary expression
Added test for generation of sequence concatenation (e.g. [1,2,3] ^ [4,5,6]) binary expression
Minor white space correction to test
Added trimming of generated Java output for simple expressions
Added test for generation of 'reverse' unary expression
Added test for generation of sequence index expression
Updated test results for generation of 'tl' unary expression
Fix for generation of 'tl' unary expression
Updated test results for 'Employee' specification test due to changes in the way the 'tl' unary expression is generated