Changes to Get a list of subcorpora in the corpus or create/delete a subcorpus.

added the new required query request parameter subcname

the query request parameter delete was restricted to a list of enum values

for the query request parameter delete, default value 0 was added

for the query request parameter delete, the type changed from string to integer

added the new optional query request parameter create

added the new optional query request parameter format

added the new optional query request parameter json

added the new optional query request parameter q

added the new optional query request parameter struct

added the new enum value 0.00 to the query request parameter delete

added the new enum value 1.00 to the query request parameter delete