Three screens (urls)
1. List the contents of the file with buttons to add, delete, edit, save-all,quit
2. Entry screen 
3. Help screen (minimal)

Todo
*** Handle the gui for frequency
***	verify dates are almost reasonable
***	format the security display string
***	Find the selected check entries
***	Does [multi] delete work?
***		(doublecheck when file load/save is working
-->	compute the gui yields and dates properly
*** 	Approximation formula doesn't suck too bad
-->		Still need to come up with better iterative formula
--> 	Discount rates and/or reinvestment rates
***	Don't append to secFile.entry willy-nilly
***	Don't load dups
*** Use the user dir/curdir for the 'ytmsec.csv' file
***		split between new and load/save, saveAs
***	Write the load code for the load button
*** The save/quit code should know about unsaved files.
--> Update prices from yahoo
***		The ruby/finance lib is a bit two complicated for me. Pain to install in Shoes?
***		The yahoo call and response is pretty straightforward
***		Online update turns outs out to be a less useful than I thought.
-->		It works on the new/edit screen. Next is the setupscreen