Parse and output reaffirmed identifiers in short form

[mico]

@ronaldtse "ANSI C37.53.1-1989 (R1996) (Revision of ANSI C37.53.1-1982)" (https://ieeexplore.ieee.org/document/1389208) I'm wondering what is (R1996) here. Looks like a revision and year, but it's not 1996 year... More PubIDs like that:

IEEE Std 1458-2005 (R2010)
IEEE Std 1541-2002 (R2008)
IEEE Std 665-1995 (R2001) (Revision of IEEE Std 665-1987)
IEEE Std 771-1998 (R2009)

Upd: IEEE Std 771-1998 (R2009) https://standards.ieee.org/ieee/771/1006/

So is it "reaffirmed"? Should we represent it the same way?

This should be in #17

Originally posted by @mico in https://github.com/metanorma/pubid-ieee/issues/13#issuecomment-1077037147

[mico]

https://github.com/metanorma/pubid-ieee/issues/13#issuecomment-1077039426

[ronaldtse]

@mico yes I think you are right, the "RYYYY" means "reaffirmed YYYY". We should keep the (RYYYY) pattern in the identifier. Thanks!

[mico]

duplicate #65