[Pasdoc-main] pasdoc_gui - many improvements

[Michalis K. <mic...@gm...>]

I made a lot of small improvements to pasdoc_gui in the last days.
I think for the 0.12.0 release we can put pasdoc_gui binary in normal
bin/ subdirectory (it was in that scary experimental/ subdirectory in
0.11.0 release :)

Testing binaries for Linux and Windows (i386) can be downloaded from

  http://michalis.ii.uni.wroc.pl/~michalis/tmp/pasdoc-0.12.0-snaps/

(With debug info, that's why they are a little large.)

The short introduction to pasdoc_gui usage is on
http://pasdoc.sipsolutions.net/PasDocGui , slightly updated for 0.12.0
release.

Some list of changes:

- Various anchor and autosizing improvements, hopefully it now really
works with various themes and font sizes.

- I wanted to make the most important controls more visible. For the
most basic usage, the user only cares about checking "output directory",
adding his "source files" and then clicking on generate. So 1. "output
directory" is now on main "Options" tab and is even filled with
GetTempDir for starters, 2. "source files" is the 2nd tab, and 3.
"Generate" button is clearly visible on the left wherever you are.

- xdg-open is used on Unix now to open a browser (instead of that old
$BROWSER trick).

- And various other small fixes and improvements, see SVN log...

Michalis