Makes root optional for backslashed windows-paths too
Makes root optional for backslashed windows-paths too

hmate9/Mu,raycmorgan/Mu,cgvarela/Mu,hmate9/Mu,smo-key/MuTeX,raycmorgan/Mu,smo-key/MuTeX,cgvarela/Mu,hmate9/Mu,cgvarela/Mu,smo-key/MuTeX