added conditionalPanel for rows & cols, but it doesn't work as I want because of submitButton
looking at changing submitButton to actionButton, initial attempts failed and commented out
added 'test inputs' tab, gave up on getting actionButton to work
removed nRow & nCol because not needed when map loaded, defaults used if test box selected.
update help text
solved deparse problems with Code tab (as long as matrix <500 bytes)
add map
add control tab
converting read file to a matrix and modifying dimension labels