Year + version bump for 1.13

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configure.ac

src/browser.c

src/browser.h

src/delete.c

src/delete.h

src/dir.h

src/dir_common.c

src/dir_export.c

src/dir_import.c

src/dir_mem.c

src/dir_scan.c

src/dirlist.c

src/dirlist.h

src/exclude.c

src/exclude.h

src/global.h

src/help.c