New Instance wizard: add capability to create server adapter from instance

Currently you may create a new server adapter in 2 ways:

1) fully automatically when launching the instance: check "Create Server Adapter"
2) manually:

• launch an instance
• show in remote system explorer (creates the RSE connection)
• create server adapter, switch it to remote mode and use the RSE connection as host

Option 1) is pretty error prone. If 1 of the 3 tasks fail no server adapter is created and it's hard to find out why it went wrong. IMHO the process is too automatic, too long, too intrasparent.
Option 2) is pretty transparent, but not obvious.

We would improve the situation if we would offer an action "Create Server Adapter" in the context menu of the instances.