ask for removal of old motion-twin install

git-svn-id: http://haxe.googlecode.com/svn/trunk@6287 f16182fa-f095-11de-8f43-4547254af6c6
added --run, allows to run haxe scripts directly (eg : haxe --run tools.haxelib.Main <args>)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6288 f16182fa-f095-11de-8f43-4547254af6c6
first try at make install on Linux

git-svn-id: http://haxe.googlecode.com/svn/trunk@6289 f16182fa-f095-11de-8f43-4547254af6c6
Merge branch 'haxe/master'