Merge pull request #282 from sourceryinstitute/install-doc

Install documentation tweaks

Author: zbeekman

INSTALL.md

@@ -33,11 +33,16 @@ a file from our [Releases] page and running the installation script in the top-l
 source directory:
 
 ```
-tar xvzf opencoarrays-x.y.z.tar.gz
-cd opencoarrays
+tar xvzf OpenCoarrays-x.y.z.tar.gz
+cd OpenCoarrays-x.y.z
 ./install.sh
 ```
 
+where `x.y.z` should be replaced with the appropriate version numbers.  For a scripted or unattended build, use
+`./install.sh -y` or equivalently `./install.sh --yes-to-all`, which will assume affirmative answers
+to all user prompts and will only prompt the user if an installation directory is chosen that requires
+`sudo` privelenges (by passing `-i` or equivalently `--install-prefix`).
+
 Before installing OpenCoarrays, the above bash script will attempt to detect the presence
 of the default prerequisite packages: [GCC], [MPICH] , and [CMake].  For additional details, see the [Prerequisites] section. If any of the
 aforementioned packages appear to be absent from the user's PATH environment variable,