MAINT: Use set literal for unsupported + depr args
MAINT: Use set literal for unsupported + depr args

Initializes unsupported and deprecated argument sets with set literals instead of the set constructor in pandas/io/parsers.py, as the former is slightly faster than the latter.
winklerand/pandas,GuessWhoSamFoo/pandas,winklerand/pandas,Winand/pandas,GuessWhoSamFoo/pandas,winklerand/pandas,MJuddBooth/pandas,rs2/pandas,jorisvandenbossche/pandas,MJuddBooth/pandas,nmartensen/pandas,MJuddBooth/pandas,louispotok/pandas,toobaz/pandas,gfyoung/pandas,kdebrab/pandas,kdebrab/pandas,jmmease/pandas,nmartensen/pandas,toobaz/pandas,rs2/pandas,TomAugspurger/pandas,jreback/pandas,TomAugspurger/pandas,harisbal/pandas,pratapvardhan/pandas,nmartensen/pandas,harisbal/pandas,kdebrab/pandas,jreback/pandas,jorisvandenbossche/pandas,GuessWhoSamFoo/pandas,amolkahat/pandas,jmmease/pandas,Winand/pandas,toobaz/pandas,zfrenchee/pandas,MJuddBooth/pandas,cbertinato/pandas,gfyoung/pandas,datapythonista/pandas,nmartensen/pandas,amolkahat/pandas,dsm054/pandas,gfyoung/pandas,toobaz/pandas,dsm054/pandas,louispotok/pandas,dsm054/pandas,cython-testbed/pandas,cbertinato/pandas,amolkahat/pandas,Winand/pandas,jmmease/pandas,kdebrab/pandas,winklerand/pandas,rs2/pandas,louispotok/pandas,GuessWhoSamFoo/pandas,cython-testbed/pandas,pandas-dev/pandas,dsm054/pandas,winklerand/pandas,MJuddBooth/pandas,cython-testbed/pandas,winklerand/pandas,jreback/pandas,toobaz/pandas,jreback/pandas,jorisvandenbossche/pandas,jreback/pandas,pratapvardhan/pandas,harisbal/pandas,jmmease/pandas,zfrenchee/pandas,louispotok/pandas,pratapvardhan/pandas,pandas-dev/pandas,zfrenchee/pandas,cbertinato/pandas,Winand/pandas,gfyoung/pandas,Winand/pandas,cython-testbed/pandas,amolkahat/pandas,cython-testbed/pandas,harisbal/pandas,datapythonista/pandas,nmartensen/pandas,cbertinato/pandas,TomAugspurger/pandas,zfrenchee/pandas,Winand/pandas,louispotok/pandas,pratapvardhan/pandas,harisbal/pandas,jmmease/pandas,datapythonista/pandas,amolkahat/pandas,pandas-dev/pandas,dsm054/pandas,nmartensen/pandas,zfrenchee/pandas,jmmease/pandas,TomAugspurger/pandas,jorisvandenbossche/pandas,GuessWhoSamFoo/pandas,rs2/pandas,gfyoung/pandas,cbertinato/pandas,pandas-dev/pandas,kdebrab/pandas,pratapvardhan/pandas,datapythonista/pandas