INSTALL.rst based on User Guide installation instructions (#1779).
INSTALL.rst based on User Guide installation instructions (#1779).

- Copied UG instructions as INSTALL.rst.
- Added roles and link targets need to be able to use it standalone.
- Reformatted text to work a little better when viewing the it on CLI.
- Other smallish enhancements to text.

xiaokeng/robotframework,ChrisHirsch/robotframework,nmrao/robotframework,stasiek/robotframework,joongh/robotframework,dkentw/robotframework,fingeronthebutton/robotframework,dkentw/robotframework,JackNokia/robotframework,rwarren14/robotframework,alexandrul-ci/robotframework,un33k/robotframework,yonglehou/robotframework,xiaokeng/robotframework,xiaokeng/robotframework,Colorfulstan/robotframework,ashishdeshpande/robotframework,synsun/robotframework,HelioGuilherme66/robotframework,JackNokia/robotframework,fingeronthebutton/robotframework,ashishdeshpande/robotframework,SivagnanamCiena/robotframework,SivagnanamCiena/robotframework,moto-timo/robotframework,suvarnaraju/robotframework,dkentw/robotframework,userzimmermann/robotframework,moto-timo/robotframework,fingeronthebutton/robotframework,joongh/robotframework,kurtdawg24/robotframework,kyle1986/robortframe,xiaokeng/robotframework,snyderr/robotframework,alexandrul-ci/robotframework,snyderr/robotframework,stasiek/robotframework,stasiek/robotframework,SivagnanamCiena/robotframework,un33k/robotframework,Colorfulstan/robotframework,JackNokia/robotframework,nmrao/robotframework,synsun/robotframework,alexandrul-ci/robotframework,edbrannin/robotframework,edbrannin/robotframework,synsun/robotframework,synsun/robotframework,Colorfulstan/robotframework,wojciechtanski/robotframework,wojciechtanski/robotframework,eric-stanley/robotframework,ChrisHirsch/robotframework,un33k/robotframework,moto-timo/robotframework,Colorfulstan/robotframework,stasiek/robotframework,stasiek/robotframework,dkentw/robotframework,rwarren14/robotframework,kyle1986/robortframe,jaloren/robotframework,jaloren/robotframework,jorik041/robotframework,kurtdawg24/robotframework,yahman72/robotframework,ashishdeshpande/robotframework,yonglehou/robotframework,yahman72/robotframework,eric-stanley/robotframework,snyderr/robotframework,un33k/robotframework,ChrisHirsch/robotframework,suvarnaraju/robotframework,joongh/robotframework,yahman72/robotframework,kurtdawg24/robotframework,SivagnanamCiena/robotframework,rwarren14/robotframework,jorik041/robotframework,jorik041/robotframework,alexandrul-ci/robotframework,yonglehou/robotframework,ashishdeshpande/robotframework,robotframework/robotframework,edbrannin/robotframework,kurtdawg24/robotframework,synsun/robotframework,ChrisHirsch/robotframework,wojciechtanski/robotframework,fingeronthebutton/robotframework,userzimmermann/robotframework,ChrisHirsch/robotframework,nmrao/robotframework,snyderr/robotframework,dkentw/robotframework,nmrao/robotframework,snyderr/robotframework,userzimmermann/robotframework,HelioGuilherme66/robotframework,kyle1986/robortframe,JackNokia/robotframework,un33k/robotframework,rwarren14/robotframework,JackNokia/robotframework,moto-timo/robotframework,jorik041/robotframework,HelioGuilherme66/robotframework,wojciechtanski/robotframework,kyle1986/robortframe,yahman72/robotframework,eric-stanley/robotframework,SivagnanamCiena/robotframework,joongh/robotframework,ashishdeshpande/robotframework,eric-stanley/robotframework,nmrao/robotframework,rwarren14/robotframework,edbrannin/robotframework,kurtdawg24/robotframework,suvarnaraju/robotframework,suvarnaraju/robotframework,yahman72/robotframework,kyle1986/robortframe,wojciechtanski/robotframework,alexandrul-ci/robotframework,userzimmermann/robotframework,yonglehou/robotframework,jaloren/robotframework,suvarnaraju/robotframework,Colorfulstan/robotframework,jaloren/robotframework,moto-timo/robotframework,fingeronthebutton/robotframework,userzimmermann/robotframework,robotframework/robotframework,joongh/robotframework,edbrannin/robotframework,jaloren/robotframework,robotframework/robotframework,jorik041/robotframework,yonglehou/robotframework,xiaokeng/robotframework