Add type search to Stories filter (Thread/ Post)

[alexdobre]

A user must be able to search for posts and threads in the Stories filter.

Add a radio button filter with Thread and Post as the two possible check boxes.

It needs to be a radio button because some search items are not relevant for both threads and posts. It starts with Threads selected by default.

When the Post radio button is selected the following search logic is used:

• title get's grayed out (a post does not have a title)
• category remains (a post has the same category as it's parent thread)
  • posts and views are grayed out
  • rep is enabled - a post gathers reputation by itself and also gives reputation to it's author
  • author name is enabled
  • author rep is enabled