man/mtbl_iter.3: fix rendering of "**" in mtbl_iter_next() prototype
add librsf submodule
mtbl/print_string.h: remove
mtbl_dump: use librsf/print_string.h
use librsf alloc functions
use librsf heap
use librsf vector, ubuf
use librsf crc32c
configure.ac: use automake subdir-objects
librsf: update
fileset: new
librsf: update
fileset: mtbl_fileset_source(): return ->source
configure.ac: add lib check for clock_gettime
merger: merger_iter_add_entry(): handle case where iterator is NULL after initial entry_fill()
configure.ac: bump version to 0.2
mtbl_merge: set block size of output via MTBL_MERGE_BLOCK_SIZE environment variable
fileset: add mtbl_fileset_reload() function
fileset: rename "reload frequency" to "reload interval"
man/mtbl_fileset.3.txt: new