Configure a better version number (partly or fully auto-computed)
Add support for system-wide colors.txt file
Add a command-line option to report which colors file is being used.
Add an include directive for colors files

A colors file can now specify other colors files, from which
additional node color specifications will be read. This allows, for
instance, using system-installed colors file for most colors,
and only overriding some of its colors in a custom colors file.

As a purpose of using a custom colors file may be to leave the colors
for some nodes undefined, it is now also possible to undefine a
previously defined node color (i.e. after reading another colors file
which defines a color for the node).
Improve installation and package generation; add deb and rpm

Minetestmapper can now be installed into a proper directory hierarchy
(instead of all files being dumped into /usr/local/. for instance.)

Non-hierarchical installation (or creation of a non-hierarchical archive)
is also still supported, and remains the default, for backwards compatibility.

Packaging on windows remains unchanged, due to lack of infrastructure :-)
Optimize generation of horizontally sparse maps

(i.e. maps with most but not all pixels in every row empty)
Interpret fully transparent node colors as default colors

(to be overridden by the color of any not-fully-transparent node beneath)

Fully transparent nodes also do not participate in shading.
Add a default color for nodes

This is useful to show invisible ('air' or 'invalid') nodes in blocks
that are in the database using a different color than blocks that are
not in the database (which will have no color at all, causing the
background color to show).
Allow air nodes to have a color.

As this comes with a significant performance penalty, this
feature must be enabled using the command-line option --drawair

For best results, the color of air should be fully transparent,
so that underlying nodes will override it.
Generalize processing of air and ignore nodes
Fix to redis return value verification

(thanks to clang for reporting the issue :-)
Freeminer database coordinate format support ('a<x>,<y>,<z>')
Some small changes to README.rst
Updated changelog with recent changes, and updated base version