C API 0.99.12

Minor feature release

Breaking changes

• Removed TSK_NO_BUILD_INDEXES.
  Not building indexes is now the default behaviour of tsk_table_collection_dump and related functions.
  (@molpopgen, #1327, #1337).

Features

• Add tsk_*_table_extend methods to append to a table from another
  (@benjeffery, #1271, #1287)