Clarify duk_xcopy_top() same heap requirement
Merge branch 'clarify-xcopy-top-heap'
Ditz issue update
Add 'flow' checkout to Makefile (unused now)

Flow could be used to check Ecmascript test cases.
Merge branch 'add-flow-checkout'
Typo fix
Merge branch 'proxy-test-typo'
Fix guide type: s.b. errThrow
Merge branch 'fix-guide-errthrow-typo'
Add byte offset for JSON.parse() syntax error

Remove "invalid number" error message in the process: as a result there
should be less code/constants but it's more useful to have the offset.
Testcases for JSON.parse() syntax error offset
Release note: JSON.parse() syntax error offset
Merge branch 'json-syntax-error-offset'

Add a byte offset to JSON.parse() syntax error to make it easier to debug
broken JSON.