db: rename UserFollowing.follows_repo_id to follows_repository_id Since the relationship is 'follows_repository', rename the column to be 'follows_repository_id', not 'follows_repo_id'. This also makes the Python column name match the actual database column name. (The inconsistency dates back to early RhodeCode days.)

# requirements.txt file for use as "pip install -r requirements.txt" as a
# readthedocs compatible alternative to "pip install -e ." which is a working
# alternative to "setup.py develop" which doesn't work with Mercurial 3.7
.