[phpMyAdmin Developers] 4.6.3 release

To be upfront and direct, I'm not a huge fan of having a scheduled release. I think we should release 4.6.3 when it has enough fixes to justify a new release or if a major usability issue is fixed, not just because a date on the calendar is approaching. On the other hand, it can help web hosts to know when a maintenance release is coming, although it seems many don't generally upgrade unless there's a security problem.

According to our milestone, 4.6.3 is due for release in just over a week. I don't think we're ready for 4.6.3 because there haven't been a lot of fixes in 4.6.3. I'd rather put it off, perhaps for a month, depending how things go, basically until there are more fixes justifying a release.