Allow configuration for starting with expanded selected lists

[przepompownia]

I would like to have settings (per project) that start DBUI with some items expanded.

Please see #74 (as an example for expanding table list for selected database) how we could implement it.

In the next step I would like to have cursor placed at the top of tables list.

[kristijanhusak]

Custom autocmd is fired when DBUI is opened. You can use something like this to achieve what you want.

autocmd User DBUIOpened call s:open_db()

function! s:open_db()
  "Find db.
  call search('dev')
  "Open db
  norm o
  "Find tables
  call search('Tables')
  "Open tables
  norm o
endfunction

[przepompownia]

This four-line simulation of manual actions has enoughly simple expression to close the mentioned PR ;-)