Adds missing h# levels and formats advanced search page

Closes #539 

* Adds missing headings in several pages
* Adds reformatted advanced search page

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![image](https://cloud.githubusercontent.com/assets/302258/3666231/7d69db70-11ee-11e4-9650-810aca7da744.png)

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![image](https://cloud.githubusercontent.com/assets/302258/3666241/974507d6-11ee-11e4-9705-c44bfe6d532e.png)