fixed issue 1598:Add SQLite to supported database stored migrations, thanks Alan (also reverted virtualfields that break tests)
fixed issue 1601:admin edit page first tab closing issue, thanks Paolo
Merge branch 'master' of ssh://github.com/web2py/web2py
changed way to detect missing key since None is already a possible value
bugfix native json fields were not supported correcly
Merge pull request #145 from michele-comitini/postgresql_json_bug

bugfix native json fields were not supported correcly
Merge pull request #144 from michele-comitini/dal_sum_expression_fix

changed way to detect missing key since None is already a possible value
removed '[__+-+...+-+__]' from last commit
fixed issue 1600:Centralized migrations log, thanks Alan
fixed typo in changelog, thanks niphlod
Merge ssh://github.com/web2py/web2py
fixed issue 1602:Retrieve migration data from db fails if table is not yet created
fixed issue 1599:Shell relative paths while webserver's are absolute in dal, thanks Alan
fixed issue 1596:Alias don't work with record versioning
Merge ssh://github.com/web2py/web2py
improved json validator to output meaningful error
Merge branch 'master' of github.com:michele-comitini/web2py into native_json_local_check
fixed issue 1602 again, thanks Alan
Merge pull request #146 from michele-comitini/native_json_local_check

improved json validator to output meaningful error
removed non-translatable json error