methods for assembling, parsing, manipulating and serialising SICIs

 A "Serial Item and Contribution Identifier" (SICI) is a code (ANSI/NISO
 standard Z39.56) used to uniquely identify specific volumes, articles or
 other identifiable parts of a periodical.
 .
 Biblio::SICI provides methods for assembling, parsing, manipulating and
 serialising SICIs.
 .
 Both internal implementation and public API are currently considered BETA and
 may change without warning in a future release. For more information on this
 have a look at the TODO section|/TODO below.