[Change] rewrote mapPostcode

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] importBoundaries

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] imgBrighten

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Change] rewrote plotBoundaries

Signed-off-by: Oleg Komarov <o.komarov11@imperial.ac.uk>
[Add] adding GUI