Menuinst

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* add suffix for environment name to shortcuts on win, 4
* clarify root prefix / env prefix distinction (affects menu names)

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* support 'script' key to shortcut to arbitrary executable

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* make it compatible with python 3

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* add initial support for recognition of non-admin installations
* make the shortcut function unicode

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* fix minor bug on Windows
* install system wide on Windows

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* simplified and changed API
* removed egginst dependency
* renamed appinst to menuinst
* only supports Windows for now


----------- historical AppInst changelog -----------------------------