Port number & workspace in simple address mode

- Added port number and workspace to the simple address mode, and as
such it's no longer a simpler mode.
- Changed the old simple mode to the unchecked default mode and the old
exploded mode to "IP Address Mode", now checked.
- Simplified the ServerViewer context button names so they fit on the
screen.
- The populateLayerList() in LayerViewer no longer populates layers if
there is no active ServerConnection.
- Increased time-out times; DescribeFeatureType: from 20s to 30s,
GetCapabilities: from 30s to 60s, WFS Insert: from 30s to 60s.
- Fixed a bug which caused <Exception> elements in a request response of
WFS Inserts not to throw an exception and properly cause a failed
upload.
- Changed the address access of ServerConnection so that the full
address is formed in the constructor and accessed from getAddress()
regardless of the address mode.
- Removed unnecessary set-methods in ServerConnection.
- Moved the address mode identifier constants from ServerEditor to
ServerConnection.