gitweb: Add 'show-sizes' feature to show blob sizes in tree view
Add support for 'show-sizes' feature to show (in separate column,
between mode and filename) the size of blobs (files) in the 'tree'
view. It passes '-l' option to "git ls-tree" invocation.
For the 'tree' and 'commit' (submodule) entries, '-' is shown in place
of size; for generated '..' "up directory" entry nothing is shown.
The 'show-sizes' feature is enabled by default.
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>