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- also remove deprecated *set_conf* functions

- shift to init_info struct similar to margo and abt-io
- add field for (currently unused) json

clang format

See merge request !18

minor memory bug fix in mkpool routine

See merge request !17

- scanf string field width modifier does not count null terminator

- in preparation for using json-c and/or bedrock instead

make string long enough for two chars and terminator

implement json configuration

See merge request !16

file backend module

See merge request !13

- eventually need to handle conditional compilation of bake back ends

- avoids potential HG encoder corruption if backend function fails and
  does not populate output fields