* perl/Amanda/JSON/*: json server interface.
* perl/Amanda/*: Add many functionnalities of the servewr program.
                 Modified to return Amanda::Message
* server-src/*: Mv functionalities to perl Modules.
* installcheck/*: Change for modified interface.


git-svn-id: https://svn.code.sf.net/p/amanda/code/amanda/trunk@5372 a8d146d6-cc15-0410-8900-af154a0219e0