#22 save or load filter can break logwatcher

[chrisclara]

DESCRIPTION. You have one already saved highlight
filter. There is no watcher opened. You create a
watcher with a new highlight filter. If you want to
save this new filter, this action will fail. You will
not never have this new filter in the saved filters.
A similar problem can happen with loading filters.
In some cases the view logwatcher can become
inreachable.
CORRECTION. in the method dispose() of the class
filter.java add this condition before doing the
element.dispose() : if (element.getDescription
().compareTo("Highlight line") != 0)
COMMENT. without this condition, the color of the
filter became null : --> fail.