Get rid of "Don't show closed accounts" setting

KMyMoney today contains two options which basically do the same

• Don't show closed accounts in the configuration dialog and
• Show all accounts in the View menu.

This is confusing at times, when the user changes one but does not see any effect as the other is still active. It would be more appropriate to remove the Don't show closed accounts settings and only leave the Show all accounts option in the View menu.

The following things need to be done:

• Remove the option from the settings definition
• Remove the option from the settings dialog
• Create update information to remove the entry from the kmymoneyrc file upon update
• Update the documentation (remove text and update screenshots)