the user's tty palette is needed to match to the best colour index in colourful mode

Signed-off-by: Mattias Andrée <maandree@operamail.com>
fix some tty errors

Signed-off-by: Mattias Andrée <maandree@operamail.com>
fix: NNW_SSE <=> NNE_SSW + add insert balloon support in image module

Signed-off-by: Mattias Andrée <maandree@operamail.com>
put balloon inserting into a new class, Common

Signed-off-by: Mattias Andrée <maandree@operamail.com>
m + clone support

Signed-off-by: Mattias Andrée <maandree@operamail.com>
image import height: ceiling around halve

Signed-off-by: Mattias Andrée <maandree@operamail.com>