ENH: Improved process for remote module fetching

Added an environment variable so that developers can try new revisions
without editing the remote module description file.

For example, the HEAD of the remote module can be tested by executing
these git commands in the remote module checkout:

git pull

export RemoteGitTag=`git rev-parse HEAD`
1 job for ImprovedRemoteModuleFile
Status Job ID Name Coverage
  External
passed kwrobot-commit-check