added 'macro @:pos(pos-expr) e' reification to specify an explicit pos for a whole sub expression (fixed issue #1361)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6009 f16182fa-f095-11de-8f43-4547254af6c6
allowed polymorphic functions with constraints in structures (fixed issue #1421)

git-svn-id: http://haxe.googlecode.com/svn/trunk@6010 f16182fa-f095-11de-8f43-4547254af6c6
do not add @: metadata in the output

git-svn-id: http://haxe.googlecode.com/svn/trunk@6011 f16182fa-f095-11de-8f43-4547254af6c6