fixed altitude in wp drawing
console: update mode display on HEARTBEAT
map: prevent rapid double clicks for drawing
raise version to 1.2.9
map: allow display of multiple vehicles on the map

a bit of a hack, but it will do for now
rally: Add unload method.
fence: add unload method
log: add unload method
console: Console window now closes when module is unloaded.
map: Map window now closes when module is unloaded.
mavproxy: Now catches Ctrl-C and requires 'exit' to quit.
mavproxy: requireexit setting added.  Ctrl-C only caught if set.