Improve virtual_fs.py bot.
Improve virtual_fs.py bot.

This commit fixes a bug with deleting directories,
prettifies the program's path output, and adds the
commands 'cd' (without 'cd ..') , 'rmdir' and 'pwd'.

vabs22/zulip,JPJPJPOPOP/zulip,JPJPJPOPOP/zulip,vabs22/zulip,showell/zulip,brockwhittaker/zulip,dawran6/zulip,blaze225/zulip,amyliu345/zulip,dhcrzf/zulip,tommyip/zulip,jainayush975/zulip,christi3k/zulip,amanharitsh123/zulip,timabbott/zulip,hackerkid/zulip,timabbott/zulip,sonali0901/zulip,jphilipsen05/zulip,PhilSk/zulip,rishig/zulip,synicalsyntax/zulip,vaidap/zulip,susansls/zulip,sharmaeklavya2/zulip,rht/zulip,SmartPeople/zulip,amyliu345/zulip,zulip/zulip,j831/zulip,susansls/zulip,jphilipsen05/zulip,JPJPJPOPOP/zulip,mahim97/zulip,showell/zulip,brockwhittaker/zulip,dhcrzf/zulip,eeshangarg/zulip,susansls/zulip,blaze225/zulip,jphilipsen05/zulip,zulip/zulip,sonali0901/zulip,brainwane/zulip,blaze225/zulip,jrowan/zulip,dattatreya303/zulip,blaze225/zulip,sonali0901/zulip,kou/zulip,rht/zulip,j831/zulip,zulip/zulip,isht3/zulip,jainayush975/zulip,verma-varsha/zulip,dattatreya303/zulip,tommyip/zulip,jainayush975/zulip,sharmaeklavya2/zulip,tommyip/zulip,rishig/zulip,Galexrt/zulip,jphilipsen05/zulip,jrowan/zulip,samatdav/zulip,amanharitsh123/zulip,hackerkid/zulip,aakash-cr7/zulip,susansls/zulip,vaidap/zulip,mahim97/zulip,timabbott/zulip,rht/zulip,dattatreya303/zulip,andersk/zulip,sharmaeklavya2/zulip,JPJPJPOPOP/zulip,verma-varsha/zulip,punchagan/zulip,vabs22/zulip,andersk/zulip,hackerkid/zulip,susansls/zulip,amyliu345/zulip,ryanbackman/zulip,andersk/zulip,rht/zulip,isht3/zulip,shubhamdhama/zulip,souravbadami/zulip,punchagan/zulip,zulip/zulip,eeshangarg/zulip,SmartPeople/zulip,kou/zulip,vabs22/zulip,rishig/zulip,verma-varsha/zulip,sonali0901/zulip,brainwane/zulip,Galexrt/zulip,mahim97/zulip,souravbadami/zulip,susansls/zulip,dhcrzf/zulip,jrowan/zulip,jackrzhang/zulip,jphilipsen05/zulip,samatdav/zulip,eeshangarg/zulip,hackerkid/zulip,blaze225/zulip,Galexrt/zulip,jainayush975/zulip,souravbadami/zulip,sharmaeklavya2/zulip,dhcrzf/zulip,jrowan/zulip,dawran6/zulip,jackrzhang/zulip,kou/zulip,dawran6/zulip,andersk/zulip,amyliu345/zulip,sharmaeklavya2/zulip,christi3k/zulip,punchagan/zulip,rht/zulip,synicalsyntax/zulip,isht3/zulip,timabbott/zulip,timabbott/zulip,PhilSk/zulip,ryanbackman/zulip,isht3/zulip,dhcrzf/zulip,tommyip/zulip,tommyip/zulip,andersk/zulip,eeshangarg/zulip,amanharitsh123/zulip,hackerkid/zulip,zulip/zulip,timabbott/zulip,souravbadami/zulip,sonali0901/zulip,sharmaeklavya2/zulip,shubhamdhama/zulip,aakash-cr7/zulip,jackrzhang/zulip,brainwane/zulip,dawran6/zulip,shubhamdhama/zulip,dattatreya303/zulip,christi3k/zulip,j831/zulip,vabs22/zulip,punchagan/zulip,dattatreya303/zulip,sonali0901/zulip,vaidap/zulip,jackrzhang/zulip,aakash-cr7/zulip,jainayush975/zulip,Galexrt/zulip,dawran6/zulip,blaze225/zulip,j831/zulip,showell/zulip,synicalsyntax/zulip,mahim97/zulip,synicalsyntax/zulip,jphilipsen05/zulip,aakash-cr7/zulip,vaidap/zulip,ryanbackman/zulip,andersk/zulip,brainwane/zulip,brockwhittaker/zulip,andersk/zulip,brainwane/zulip,showell/zulip,punchagan/zulip,samatdav/zulip,rishig/zulip,christi3k/zulip,jainayush975/zulip,showell/zulip,vaidap/zulip,amyliu345/zulip,rht/zulip,timabbott/zulip,hackerkid/zulip,hackerkid/zulip,brockwhittaker/zulip,ryanbackman/zulip,verma-varsha/zulip,showell/zulip,SmartPeople/zulip,verma-varsha/zulip,ryanbackman/zulip,j831/zulip,jackrzhang/zulip,kou/zulip,kou/zulip,eeshangarg/zulip,jrowan/zulip,isht3/zulip,shubhamdhama/zulip,samatdav/zulip,dawran6/zulip,dhcrzf/zulip,synicalsyntax/zulip,eeshangarg/zulip,christi3k/zulip,aakash-cr7/zulip,SmartPeople/zulip,jackrzhang/zulip,dattatreya303/zulip,Galexrt/zulip,brainwane/zulip,vabs22/zulip,jackrzhang/zulip,amanharitsh123/zulip,tommyip/zulip,samatdav/zulip,mahim97/zulip,PhilSk/zulip,kou/zulip,rishig/zulip,punchagan/zulip,vaidap/zulip,JPJPJPOPOP/zulip,jrowan/zulip,shubhamdhama/zulip,tommyip/zulip,samatdav/zulip,dhcrzf/zulip,shubhamdhama/zulip,rishig/zulip,j831/zulip,synicalsyntax/zulip,amyliu345/zulip,mahim97/zulip,brockwhittaker/zulip,showell/zulip,SmartPeople/zulip,PhilSk/zulip,aakash-cr7/zulip,PhilSk/zulip,punchagan/zulip,christi3k/zulip,SmartPeople/zulip,isht3/zulip,rishig/zulip,kou/zulip,zulip/zulip,ryanbackman/zulip,souravbadami/zulip,PhilSk/zulip,amanharitsh123/zulip,rht/zulip,brockwhittaker/zulip,amanharitsh123/zulip,Galexrt/zulip,Galexrt/zulip,zulip/zulip,souravbadami/zulip,JPJPJPOPOP/zulip,brainwane/zulip,synicalsyntax/zulip,shubhamdhama/zulip,verma-varsha/zulip,eeshangarg/zulip