Further work, refactoring and reformatting of new http transport code

Move utils into other Util modules.
Reformat all code to 80 cols.
Reorder code and add more comments.
Use long form style program args, e.g. --silent rather than -s
Finish implementation of form upload with wget
Fix reporting of server error messages for upload (curl & builtin)
Implement collecting of ETags for curl and wget.
Fix wget for case of 304 not modified response (wget uses exit code 8).
Rework transport configuration phase.