Merge branch 'next'

* next:
  fix, PEBKAC, pass an actual index into the edge-list to rem_from_edglst()
  fix, PEBKAC, fiddle with the tail of the list (decrement by idx) AFTER we've done a comparison in rem_from_edglst()
  fix, PEBKAC, when tcbdbaddint() fails, remove the vertex right away
  minor, provide (example) rotz-del tool to delete tags
  minor, generate an undirected graph in rolf-add
  minor, kick all unused code from rolf-add tool
  minor, use rotz vertex and edge api in rotz-add tool (for testing purposes)
  minor, provide edge api
  chore, kick all the high-level sym/tag addding stuff from rotz.h
  minor, use rotz vertex api in rotz-add tool (for testing purposes)
  minor, start with librotz
  minor, check for libtool
  minor, actually deal with tag2sym and sym2tag resolution
  minor, initial import of rotz-add command
  fix, PEBKAC, actually provide a version.c template, version.c.in
  chore, look for tokyocabinet installation
  minor, provide SXE_CHECK_CCLD_FLAG to pass on flags that go to the CCLD linker