win32 paths need some conversion

win32 paths need some conversion
boosts native path type doesn't match win32
conventions quite correctly so before passing
a user entered file name we need to convert it.***END OF DESCRIPTION***

Place the long patch description above the ***END OF DESCRIPTION*** marker.
The first line of this file will be the patch name.

This patch contains the following changes:

M ./alg/glseqbrowser.cpp -1 +1
M ./mussa_exceptions.hpp +1
M ./mussagl.pro -1 +4
M ./qui/MussaWindow.cpp -3 +9
M ./qui/mussa_setup_dialog/MussaSetupWidget.cpp -5 +8
M ./qui/mussagl.cpp -6 +17