GSim 0.20.0 released

This is a bug fix release with some improvements:

* Processing function autoBruker checks value of GRPDLY before
trying to compute the group delay. This should improve import
of Bruker FID from recent spectrometers

* It's possible to set slope and tilt for integral curves using
'adjust integrals' dialog

* Debian package available. Created on Ubuntu 11.

* Improvements in deconvolution routine: the value in the tables
with deconvolution model can be changed rotating the mouse
wheel. A column with integral values is added to the table
with line parameters.

* A couple of bug fixes

* Based on new Qt 4.7.3