directory re-organization (keeps the old build system)

there is no internal modification of any file in this commit

files are moved into directories according to established standards in
sourcecode distribution; these directories contain:

src - Files that are used in constructing the executable binaries,

but are not installed.

doc - Files in HTML and text format that document usage, quirks of

the implementation, and contributor checklists.

locale - Files that contain human language translation of strings

used in the program

contrib - Files contributed from distributions or other third party

	   implementing scripts and auxiliary programs