Merge branch 'cc/signed-fast-export-import'

"git fast-export | git fast-import" learns to deal with commit and tag objects with embedded signatures a bit better. * cc/signed-fast-export-import: fast-export, fast-import: add support for signed-commits fast-export: do not modify memory from get_commit_buffer git-fast-export.adoc: clarify why 'verbatim' may not be a good idea fast-export: rename --signed-tags='warn' to 'warn-verbatim' fast-export: fix missing whitespace after switch git-fast-import.adoc: add missing LF in the BNF