Changes:
– data is (un)metafied – compatibility with normal database usage
– new parameter "zgdbm_tied", array holding tied parameters' names
– new builtin "zgdmpath", returning ($REPLY) path to database file, of
given tied parameter
– new tests (Unicode, metafication, new parameter)
– updated documentation

Original db_gdbm was a no-go because it sucked widget names into
database:

https://asciinema.org/a/12ffm5ltpj9udnmradtat17am

Current db_gdbm is a no-go because GDBM doesn't always return \0
terminated strings.. Sorry for that, but the update solves this.

I sent is as patch, plus the new file (as option, patch includes)
Test/V11db_gdbm.ztst.

-- 
  Sebastian Gniazdowski
  psprint2@fastmail.com