Add GDBM support.Add mode switch for standalone and libsylph app.
bumped version to 0.3.
bumped the version to 0.2.
use plain text file to store status.
added filter-private.h to distribution.
sylfilter: show available kvs.
addes SQLite3 support.
check for QDBM on configure.
added built-in libsylph, and use it from textcontent-filter.c.