Merge pull request #982 from bronze1man/pr-test1

add a test case for #599 Symbols from *_test.go files in the same package should be shared.
More work on constant expression computation.
Sort the package list in the test runner dropdown box
Merge pull request #983 from horkhe/master

Sort the package list in the test runner dropdown box
Resolve map composite literal keys to constants.
Make the Composite resolve work again.
Fixed a failing test.
add constantExpressions from golang spec