Allow to redirect instead of IFrame for some setups

[nickvergessen]

Fix #27

@MorrisJobke in case you want to review this

[radiantwave]

Also please add an option to open in new tab!

[nickvergessen]

Sorry that is not possible, because of how the menu navigation is generated by the server.

[pirate]

It is possible if it shares code with ownCloud @nickvergessen, I finished this recently for ownCloud and will be submitting a PR to nextcloud soon: owncloud-archive/apps#2221

It's a PR that adds a user configurable option for the link taget: '_blank', '_top', '_self' (new window/tab, replace current tab, open in iframe).

[nickvergessen]

Yeah well, our menu navigation is different from the owncloud one ;)

[pirate]

Cool, didn't realize the code diverged that much from OC.

• opening link in iframe (default)
• redirecting current window to link (finished in this PR)
• opening link in new window

To get the final new window functionality, could we do something like:

1. user clicks external site link, goes to /external/1/
2. on /external/1/ the following JS executes:

window.open(external_url);
window.history.back();

3. they are sent back to their previous page, and the link is opened in a new tab