better admin interface

I noticed that tha table themed admin interface for table style output was very difficult to follow, too wide and too not fit for the views admin interface, so attached is a, IMHO, more inline with views admin interface.

First of all, I fixed "collapsable" for "collapsible" as that's the correct FAPI attribute.

Then I put all the field table options in a fieldset and have that not collapsed. Then have all of the other settings per fields collapsed except for the position settings.

I also did something similar to the unformatted field settings, although this one was actually more into this line of things, so I mostly give both a similar look and feel for the configuration settings.

I also removed the theme function for styling this and hence, the viuews_pdf.admin.inc.

Will submit patch now.