Conditional glibtoolize for OSX

The tool should be glibtoolize on OSX.
add supported platform
fixed illegal escape characters (\B0 in stead of \xB0)
fixed qucs docs dir (windows)
Merge pull request #15 from guitorri/osx_build

OSX build
Merge branch 'master' of github.com:fransschreuder/qucs
Fixed digital simulation for ubuntu
Fixed drag'n drop of components
Ported qucs-edit to Qt4

Tested without Qt3Support
Initial port qucs-lib to Qt4

Trying to remove any trace of Qt3Support.
Added Library Manager back to menu
Continued work in qucs-doc/textmode description
Fixed the qucs-lib manager

It should now create the radio buttons for each user library on
~/.qucs/user_libs. It can rename and delete these files.

It compiles and runs *without* Qt3Support. Not tested thorougly thou.

Still TODO. Add an scrollable area just in case the user has
a long list of libs.
Merge pull request #16 from guitorri/qucsedit_qt4

Ported qucs-edit to Qt4
Merge pull request #17 from guitorri/qucslib_qt4

Ported qucs-lib to Qt4
Merge branch 'master' of ssh://git.code.sf.net/p/qucs/git
fixed case sensitive include filenames in qucs-lib
  * Added an option to download the octave installer in Windows
  * In Ubuntu: octave is now on "recommends", will be installed by default
Initial changes qucs-attenuator Qt4 only.

Trying to get rid of Qt3Support.
Small fix, cleanup

Fix the layout of the help dialog.
Remove unused includes and forward declarations.