workaround to locate a local copy of Text::CSV we need
moved configuration to external file (agilegridplanner.cfg)
improved error reporting around config variables
further improved error messages when config is invalid.
documentation augmented to include configuration options
housekeeping: removed redundant code
grid dividers move based on size of grid, cards are yellow by default
grid dividers move based on size of grid, cards are yellow by default
hover over a card or the size shows the full title and the size
showing/hiding key is configurable