Adds the VERSION file.

Adds the VERSION file appended when possible to the version information
of each tool.
Change printf format.

The format used in retrieve_user and retrieve_group was invalid.
Adds support for sticky bit in chmod.

Until now the sticky bit (+t) was completely ignored in chmod. This
patch fix this and adds the support sticky bit in the BSD setmode
function. Other tools related to setmode are affected as well.
Rename makefile to Makefile.

Use the name Makefile with a capital letter as recommended in the GNU
Make manual.
Changes e-mail address.

This changes my e-mail address in some old files.