* amandad-src/amandad.c: Handle senddiscover service.
* client-src/Makefile.am: Build senddiscover.
* client-src/client_util.c: Parse DISCOVER backup support option.
* client-src/client_util.h (backup_support_option_t): Add discover.
* client-src/senddiscover.c: New client service.
* common-src/Makefile.am: Add ammessage.
* common-src/ammessage.c: Add struct and function to handle Message
  and print them in JSON format.
* common-src/ammessage.h: Add prototype.
* common-src/conffile.c: Fix json indentation.
* perl/Amanda/Message.pm: Add senddiscover.


git-svn-id: https://svn.code.sf.net/p/amanda/code/amanda/trunk@5845 a8d146d6-cc15-0410-8900-af154a0219e0