Bump version

Overview of changes:

 *  Converted to pure shellfu library

    So far we have relied on users embedding Saturnin inside their app
    and updating it by porting changes manually.  This has been awkward
    but was safer for preliminary versions where feature set was not
    stable and separation of the library and the app skeleton has not
    been done properly.

    Nowadays, these problems have been mostly resolved; the feature set
    seems to be stable and the app skeleton has been reduced to only the
    few lines, so it's time to make Saturnin a proper shellfu library.
    Of course, Saturnin can still be embedded, but primary use case is
    to depend on it and import it just as any other shellfu module.

    The 'satcmd' demo app has been moved to a different repo.

 *  Ported conf merge tests from old inigrep

    This was a long-standing debt from the inigrep split.  Tests
    originally created for inigrep have been ported to focus on
    saturnin__conf(), throwing few more in for good measure.

 *  Enabled --help (friendly usage()) in saturnin__conf()

    saturnin__conf() (exposed to user as `myapp conf`) now supports the
    obligatory --help argument.

 *  Did some updates and cleanups.

mkit.ini

@@ -1,8 +1,8 @@
 #mkit version=0.0.14
 
 [project]
-    version     = 0.3.3
-    codename    = StrycF
+    version     = 0.4.0
+    codename    = DoktorV
     name        = Saturnin
     tagline     = Spirit of your toolbox
     pkgname     = shellfu-bash-saturnin