Bump version

Overview of changes:

 *  Added data-sampler pseudo-target

    To help developers see what tokens are available, this pseudo-target
    just prints list of tokens and their values, for built-in tokens as
    well as for user-defined.

 *  Removed obsolete build_manpages target and 'markdown' type

    These were not compatible with current design od MKit and will
    be better off re-implemented as plugins.

 *  Items in changelog template are now delimited by empty line

    Just for convenience when formatting and extending.

 *  ini() can now list all sections from mkit.ini ('ini lssect')

 *  Refactored internal functions with double underscore

 *  Updated own meta-data

 *  Fixed small typos in comments and docstrings

 *  Quoted $MKIT_DIR properly in mkit.mk

 *  Updated own dogfood

mkit.ini

 #mkit version=0.0.14
 
 [project]
-    version     = 0.0.25
+    version     = 0.0.26
     codename    = wilderness
     name        = MKit
     tagline     = Simple install helper