add explicit Content-Length header to http response (otherwise it is missing in HEAD responses);

add HEAD to http server: should send same header fields as if request was GET;

tuned;

tuned spelling;

support direct rsync from Hg_Sync result directory (usually requires option -d "~~/dirs");

clarified signature;

more general dirs for Sync.sync;

tuned whitespace (amending beb4ee344c22);

clarified signature (see also be0ab4b94c62 and c41791ad75c3);

tuned;