Update GUI-Layout-Management.schelp

I added example about the question why a UserView might not show up in a Layout.
Updated the description and added an explanation about pan laws.
Update Balance2.schelp
Updates the description.
Update the description of LinPan2.
README: adapt all README files to markdown
README: change all README files extenstion to markdown
README: use plain text for URLs as Github automatically convert them
README: use underlines instead of hash-signs for h1 & h2 headers
README: remove all language identifiers from code blocks
README_linux: small correction on how to run sclang
readme: osx - remove 10.8 warning (re 29681f4)
Update Object.sc

By using the same .dup method as Function, the Object:dup improves considerably in speed.
Add Thumbs.db to ignored files
For Windows install supernova to SuperCollider folder
Add two icon-files for sclang and scide resource files
Add win-rc-files for sclang and scide and and add icons to execs
Simplify Win-installer (remove options and comment out gedit related code)
Register installer in Add-/Remove programs and remove registration on uninstall
Associate filetypes sc scd and schelp with SC and attach cube icon