Add use_formal_grammar option to runtests.
Add use_formal_grammar option to runtests.

fperez/cython,madjar/cython,hhsprings/cython,JelleZijlstra/cython,scoder/cython,ChristopherHogan/cython,andreasvc/cython,marscher/cython,JelleZijlstra/cython,hickford/cython,acrispin/cython,hickford/cython,hhsprings/cython,andreasvc/cython,madjar/cython,ABcDexter/cython,hhsprings/cython,scoder/cython,fabianrost84/cython,mcanthony/cython,JelleZijlstra/cython,c-blake/cython,marscher/cython,fperez/cython,fperez/cython,mcanthony/cython,slonik-az/cython,hickford/cython,ABcDexter/cython,hhsprings/cython,cython/cython,roxyboy/cython,acrispin/cython,JelleZijlstra/cython,slonik-az/cython,roxyboy/cython,da-woods/cython,acrispin/cython,JelleZijlstra/cython,c-blake/cython,mrGeen/cython,dahebolangkuan/cython,mrGeen/cython,andreasvc/cython,mrGeen/cython,slonik-az/cython,achernet/cython,achernet/cython,madjar/cython,madjar/cython,ABcDexter/cython,madjar/cython,scoder/cython,mrGeen/cython,mcanthony/cython,roxyboy/cython,cython/cython,ABcDexter/cython,encukou/cython,fabianrost84/cython,c-blake/cython,encukou/cython,fabianrost84/cython,dahebolangkuan/cython,da-woods/cython,slonik-az/cython,roxyboy/cython,marscher/cython,mcanthony/cython,cython/cython,ABcDexter/cython,acrispin/cython,cython/cython,achernet/cython,marscher/cython,fabianrost84/cython,slonik-az/cython,ChristopherHogan/cython,dahebolangkuan/cython,c-blake/cython,encukou/cython,encukou/cython,andreasvc/cython,fperez/cython,hickford/cython,andreasvc/cython,scoder/cython,mrGeen/cython,marscher/cython,hickford/cython,hhsprings/cython,da-woods/cython,roxyboy/cython,ChristopherHogan/cython,fperez/cython,dahebolangkuan/cython,da-woods/cython,acrispin/cython,c-blake/cython,achernet/cython,dahebolangkuan/cython,mcanthony/cython,achernet/cython,fabianrost84/cython,encukou/cython