* common-src/conffile.h (property_t) : Add visible field
* man/xml-source/amanda.conf.5.xml: Document the new hidden|visible
  keyword
* perl/Amanda/Config.swg: Add the visible field
* perl/amglue/ghashtable.c: Add the visible field
* server-src/diskfile.c: Do not add hidden dumptype property to the
  xml string


git-svn-id: https://svn.code.sf.net/p/amanda/code/amanda/trunk@7152 a8d146d6-cc15-0410-8900-af154a0219e0