Fix ambiguity in shellvars.aug by making semi-colons illegal in bquot and arrays.
Fix ambiguity in shellvars.aug by making semi-colons illegal in bquot
and arrays.

jjlin/augeas,hercules-team/augeas,raphink/augeas,MikaelSmith/augeas,lutter/augeas,GeoffWilliams/augeas,pevalme/augeas,manandbytes/augeas,manandbytes/augeas,jjlin/augeas,dafugg/augeas,jjlin/augeas,kumy/augeas,mchf/augeas,pevalme/augeas,hercules-team/augeas,lutter/augeas,ptoscano/augeas,mlichvar/augeas,jtopjian/augeas,ptoscano/augeas,kumy/augeas,mlichvar/augeas,mchf/augeas,dafugg/augeas,jasperla/augeas,kumy/augeas,raphink/augeas,lutter/augeas,pevalme/augeas,kunkku/augeas,MikaelSmith/augeas,jtopjian/augeas,kumy/augeas,mlichvar/augeas,ptoscano/augeas,kunkku/augeas,kunkku/augeas,dafugg/augeas,hercules-team/augeas-do-not-use,jasperla/augeas,hercules-team/augeas-do-not-use,GeoffWilliams/augeas,hercules-team/augeas-do-not-use