knowledge base not converting all items to lower case

[oscar-lima]

bug discovered with martkinkoling PR

PDDL is supposed to be case insensitive, in practice what this means is that all is (should be) converted to lowercase.

[m312z]

I would prefer to have all comparisons be case insensitive. Otherwise capitalization will be lost in various nodes, e.g. reading a problem file into the KB and writing again after some minor modifications.

[oscar-lima]

ok agreed