Improve centering for TAB glyph for 6-strings.
Improve centering for TAB glyph for 6-strings.

aerhard/vexflow,mwicat/vexflow,JasonLil/vexflow,cdosborn/vexflow,vikeen/vexflow,cdosborn/vexflow,ecompositor/vexflow,trinketapp/vexflow,wander2001/vexflow,Chipairon/vexflow,ecompositor/vexflow,avorio/vexflow,aaronmars/vexflow,ssoRL/vexflow,lasconic/vexflow-musicxml,Silverwolf90/vexflow,Petezah/vexflow,mariushe/vexflow,clecap/vexflow-musicxml,winning1120xx/vexflow,bsouthward/vexflow,toni07/vexflow,voidest1/vexflow,jbernie2/vexflow,natedsaint/vexflow,bsouthward/vexflow,DigitalCoder/vexflow,Silverwolf90/vexflow,natedsaint/vexflow,aaronmars/scottish-writer,niklasgrahl/vexflow,vmoll/vexflow,winning1120xx/vexflow,cute/vexflow-musicxml,rukor/vexflow,natedsaint/vexflow,Mdonmounts/vexflow,LarryKu/vexflow,JasonLil/vexflow,DigitalCoder/vexflow,fgeorgy/vexflow,Kosar79/vexflow,burnnat/vexflow,mcanthony/vexflow,Daremyth/vexflow,Chipairon/vexflow,redreamality/vexflow,vmoll/vexflow,spencerhitch/vexflow_extended,jcrogel/vexflow,FatPanther/vexflow,zachledoux/vexflow,zex713/vexflow,Kosar79/vexflow,mwicat/vexflow,jmahmud/vexflow,cute/vexflow-musicxml,lasconic/vexflow-musicxml,alexmao86/vexflow,pinxue/vexflow,johndpope/vexflow,aaronmars/vexflow,alexmao86/vexflow,dfcreative/vexflow,liuyang1204/vexflow,toni07/vexflow,mcanthony/vexflow,clecap/vexflow-musicxml,nybbs2003/vexflow,clecap/vexflow-musicxml,dhruvrajan/vexflow,bwbohl/vexflow,voidest1/vexflow,Tails/vexflow,gaborveszpremi/vexflow,Fabrico/vexflow,spencerhitch/vexflow_extended,aaronmars/scottish-writer,FatPanther/vexflow,shuanzi/vexflow,Chipairon/vexflow,alexmao86/vexflow,wander2001/vexflow,LarryKu/vexflow,jcrogel/vexflow,RSid/vexflow,ringw/vexflow,vikeen/vexflow,aaronmars/scottish-writer,fgeorgy/vexflow,aerhard/vexflow,IcculusC/vexflow,avorio/vexflow,voidest1/vexflow,JanvanCasteren/vexflow,Huji/vexflow,redreamality/vexflow,spencerhitch/vexflow_extended,cute/vexflow-musicxml,burnnat/vexflow,Tails/vexflow,toni07/vexflow,ssoRL/vexflow,JanvanCasteren/vexflow,lasconic/vexflow-musicxml,bwbohl/vexflow,bsouthward/vexflow,LarryKu/vexflow,winning1120xx/vexflow,DigitalCoder/vexflow,Charlie-Wellesley/vexflow,Petezah/vexflow,Tails/vexflow,FatPanther/vexflow,bwbohl/vexflow,Silverwolf90/vexflow,zex713/vexflow,cpill0789/vexflow,springzh/vexflow,dfcreative/vexflow,mariushe/vexflow,nybbs2003/vexflow,Charlie-Wellesley/vexflow,cute/vexflow-musicxml,gaborveszpremi/vexflow,IcculusC/vexflow,johndpope/vexflow,trinketapp/vexflow,Charlie-Wellesley/vexflow,avorio/vexflow,Huji/vexflow,Fabrico/vexflow,jmahmud/vexflow,vmoll/vexflow,redreamality/vexflow,cpill0789/vexflow,JanvanCasteren/vexflow,RSid/vexflow,zachledoux/vexflow,zhhz/vexflow,Mdonmounts/vexflow,dhruvrajan/vexflow,Petezah/vexflow,JasonLil/vexflow,nybbs2003/vexflow,ssoRL/vexflow,jmahmud/vexflow,Mdonmounts/vexflow,jcrogel/vexflow,cdosborn/vexflow,pinxue/vexflow,clecap/vexflow-musicxml,zhhz/vexflow,wander2001/vexflow,aerhard/vexflow,burnnat/vexflow,IcculusC/vexflow,liuyang1204/vexflow,liuyang1204/vexflow,Fabrico/vexflow,dfcreative/vexflow,dhruvrajan/vexflow,niklasgrahl/vexflow,mcanthony/vexflow,gaborveszpremi/vexflow,niklasgrahl/vexflow,fgeorgy/vexflow,Huji/vexflow,ecompositor/vexflow,rukor/vexflow,rukor/vexflow,toni07/vexflow,springzh/vexflow,zex713/vexflow,Daremyth/vexflow,jbernie2/vexflow,mwicat/vexflow,aaronmars/vexflow,springzh/vexflow,cpill0789/vexflow,Daremyth/vexflow,Kosar79/vexflow,pinxue/vexflow,trinketapp/vexflow,shuanzi/vexflow