r20538: Web Application Framework

r20538: Web Application Framework

- correct an error message in the JSON-RPC server

- provide a common RPC request function

- make it easier to have multiple pending RPC requests.  this allows an
  application-specified request to return "not logged in"; authentication
  information to be requested and sent; and the original request to be
  reissued.

- in statistics module, if a time is provided as zero, leave it blank rather
  than displaying 1 Jan 1970.  this showed up in the last_used_at field in the
  SMB status report.

- clean up makefile: remove no-longer-used hard-coded path and install target;
  remove "chmod" and "nice" commands which were part of the original skeleton,
  since that is not deemed appropriate for samba makefiles
(This used to be commit 339ee73ce2809905f608b1003cc645231f256420)