Added macro support to qgit

I have pushed some patches that add macros to qgit.

From menu bar it is possible to  run a macro created by a fancy new

dialog invoked by 'Macros->Setup macros...' menu.

See http://digilander.libero.it/mcostalba/macros_menu.png
        http://digilander.libero.it/mcostalba/macros_dialog.png

A macro can be associated to a any sequence of commands or to an
external script.

In case of commands sequence, these will be wrapped up in a temporary
script and executed as a whole.

A macro can also ask for command line arguments before to be run so to
allow for maximum flexibility. In case of multi commands sequence
given command line arguments will be bounded to first one only.

While a macro is running a terminal window is shown to display the
corresponding output.

qgit repository is: git://git.kernel.org/pub/scm/qgit/qgit.git

Comments and feedback are welcomed.

     Marco