Fix reader to allow extending readtables with character names such as #\underscore
Fix reader to allow extending readtables with character names such as #\underscore

acenode/gambit,thewhimer/gambit,BeImprovised/gambit,thewhimer/gambit,BeImprovised/gambit,thewhimer/gambit,acenode/gambit,acenode/gambit,thewhimer/gambit,jasperla/gambit,jasperla/gambit,BeImprovised/gambit,ivankelly/gambit,thewhimer/gambit,ivankelly/gambit,ivankelly/gambit,jasperla/gambit,acenode/gambit,jasperla/gambit,thewhimer/gambit,BeImprovised/gambit