Edit for an alternate option for 'inf' in labels (#185)

* Edit for an alternate option for 'inf' in labels

inf label in the legend is not appropriate on most of the occasions. Instead of that, a greater than (>) symbol can be added to the maximum value.
Proposed in issue 158 (#158 (comment)).
legend labels
[0.0 : 2.0 )
[2.0 : 4.0 )
[4.0 : 6.0 )
[6.0 : inf )

from this to this
[0.0 : 2.0 )
[2.0 : 4.0 )
[4.0 : 6.0 )
>6.0

* fix last digit and rebase

* short-circuit for empty labels

* refresh baseimages

Co-authored-by: Filipe Fernandes <[email protected]>
Thanks @sampr7

Author: sampr7