Properly document the local_* methods

Make all html producing methods take an 'other_tags' parameter that allows any other
tags (eg style, width etc) to be specified.  May not be needed for event_link and 
the local_* methods

Expand the example to use all the functionality of the module suite.

Include a ready-to-run example (perhaps the same example as in the synopsis)

Consider explicitly writing action => '?' in the start_form call in screen_main in
CGI::Panel::MainPanel so that redundant GET parameters are not shown in the URL window.

Merge CGI::Panel::MainPanel into CGI::Panel to make it simpler to use.  Have
a think about this and decide which way is better.  I really think that
merging it will be better.

