We need to call APLOG_USE_MODULE() so that the module name is reported
properly in log lines, and per module logging level can be set.

Fixes #6

USe automake directives to directly invoke the apxs favored libtool,
and use APXS only to perform the final install.

Fixes #4

Drop cflags and libs options that make apxs unhappy

Closes #3

This allows to always define the keytab in terms of GssapiCredStore
options instead of having to set a KRB5_KTNAME variable.

Fixes Issue 2

Fix wrong description