clarified signature and modules;

tuned;

avoid conflict with slf4j from sqlite (see also dcddfe4f43a3), notably this message on "isabelle find_facts": SLF4J(W): Class path contains multiple SLF4J providers. SLF4J(W): Found provider [org.slf4j.nop.NOPServiceProvider@1576514a] SLF4J(W): Found provider [org.apache.logging.slf4j.SLF4JServiceProvider@6a84d4e3] SLF4J(W): See https://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J(I): Actual provider is of type [org.slf4j.nop.NOPServiceProvider@1576514a]

misc tuning;

tuned: fewer warnings in IntelliJ IDEA;

tuned headers;

tuned headers;

more NEWS + CONTRIBUTORS;