* server-src/amvault.pl: Add --incrs-only argument.
* man/xml-source/amvault.8.xml: Document --incrs-only argument.


git-svn-id: https://svn.code.sf.net/p/amanda/code/amanda/branches/3_3@5235 a8d146d6-cc15-0410-8900-af154a0219e0