Merge branches 'js/lsfix', 'pb/config' and 'jn/web' into next

* js/lsfix:
  Initialize lock_file struct to all zero.

* pb/config:
  Read configuration also from $HOME/.gitconfig
  Fix setting config variables with an alternative GIT_CONFIG

* jn/web:
  Make CSS file gitweb/gitweb.css more readable