More elegant version of groupConsec.
More efficient version of groupConsec.
Made circa field of RefDate a Bool.
Util:  parseBool also handles String values that can be interp as Bool.
Util, parseBool: Don't coerce String to Bool.
Handle 'circa' with 'date-parts'.

Makes uncertain-dates test pass.
Empty locator label defaults to "page".

Fixes
citeproc-test/processor-tests/machines/integration_IbidWithDifferentLocators.json
test-citeproc:  If full paths given in arguments, find files there.

Otherwise try to match tests in the standard test directory.