Created new "howto" folder

Following a conversation on the FOF Google Group, I am submitting the creation of new folder that is specifically dedicated to the random howto, tips and tricks on how to accomplish certain tasks in FOF.

This will let any user the freedom to add a topic without worryng to much about the overall structure of the documentation.

From this bucket, we can then pick relevant information and place them in the correct section of the manual.

I suggest also to move here the "tips and tricks" section of the old FOF wiki.