Blue square icon in the map view

[PTNLemay]

I did a quick search of the forum, but I couldn't find anything relating to this.  I've got this blue square icon that is showing up in my map every now and then.  Usually it's a ship I've recently used.  I have no idea what it's for.  http://i.imgur.com/nsTSjXE.png  If anyone recognizes it and could tell me what it does, I'd be grateful.

These are the mods I have installed at the moment, in case it's something from one of them.  

Distant Object Enhancement

Extraplanetary Launchpads

Kerbal Attachement System

Kerbal Inventory System

Kerbal Stats

Infernal Robotics

MechJeb 2

Module Manager

Toolbar  (I uninstalled this one but it's possible CKAN put it back)

 

EDIT:
This is unrelated to the above question, but how do I turn off the formatting in this new forum format?  It automatically leaves that big gap for each return-to-new-line, and I don't know how to... have it not do that.

Edited January 8, 2016 by PTNLemay

[ElWanderer]

The square indicates that vessel is the target of a contract e.g. to move it to a different orbit.

[SpacedCowboy]

Yes, ElWanderer is correct. This seems to have come along with contextual contracts. I've had this occur a couple times. However, they were both debris (empty fuel tanks). The contracts wanted them moved to a different orbit. Problem was,  I had not yet opened up the "Klaw" Aside from "bumping them into their new required orbit, there was no way that was going to happen. So, there may be a bit of a bug going on here, I don't know. 

[Snark]

As the previous posters have mentioned, it means that that ship is the subject of some contract.  Note that the square gets displayed even if the contract is just one that's offered (i.e. it doesn't have to be a contract that you've already accepted), which is why it's so confusing when it pops up.

As for the formatting issue:  If you hold down the shift key when you hit enter, it goes to a new line without skipping blank space.
Like this.

But for lists such as the one you give, I'd typically use a bulleted list

• like
• this
• one

anyway. 

[PTNLemay]

All good answers, thank you for clarifying.