Revert popup buttons changes

The popup button changes requested as RM-2148
are causing many regressions like RM-2148 and
few more.
Do not attach panels by default

The panels are not not attached by default.
Use css="attached" to do that.
Fix x-bind issue on popup (RM-2509)
Fix x-show-icons issue (RM-2411)
Fix dashlet height issue (RM-2532)
Add attached attribute on panels (RM-2504)

The attached="true" can be used to keep the
panel attached with previous one.
Fix subtotal style (RM-2505)
Fix editable grid issue (RM-2531)
Fix a typo in README.md
Remove translation duplicate property name 'Delete'.
Fix rollbackOnly transaction in xml import

If the transaction is rollBack Only, commit should trigger an exception in order to catch it.
Update docs links.

SDK documentation is available on http://axelor.com/docs/sdk
Add translation for 'More' in nav menu.
Version to 3.0.1
Fix gradlew.bat not deploying axelor-gradle

The gradlew.bat script should ensure the axelor
plugins are deployed in local ivy repository.
Merge branch 'dev'
Merge pull request #1 from axelor/master

Merge