Alpha release

Alpha release of the next generation pyITC is now available (look for "Alpha" folder). It is not yet fully functional - most importantly, it is still missing model fitting. Yet it already includes:

- reworked GUI
- use of wx.plot module (matplotlib is not a dependency anymore)
- new integration algorithm based on peak fitting
- estimates of relaxation time

Beware that installing the new version may completely replace the old version, resulting in loss of functionality.