initial files for debuild to export library symbols (unfinished)

 * debuild decides to remove all symbols exported from libkdesk-hourglass.
 According to documentation the 2 files on this changeset should suffice,
 but debuild does not clearly complain, symbols disappear, and the library is useless.
Resolving kdesk's hourglass library symbols

 * Simple solution adopted is to override debuild rules
   so that the library symbols are not stipped off
Forcing kdesk dependency with libkdesk-dev, removed API decorations

 * Making sure that kdesk package drags the latest version of libkdesk-dev.
 * Fixed a typo that did not export the APIs properly to pure C clients and Python bindings.
Merge pull request #78 from KanoComputing/export-library

initial files for debuild to export library symbols (unfinished)