Menuinst

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* use explorer for filebrowser on Windows (PR 2)

* fixed shortcuts have wrong executable (PR 3)

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* added ability to specify a working directory via a 'working_dir' key
… in a shortcut definition. This is then used on win32 only to set
the 'Start in' directory of the created shortcut.

* On windows the target length is limited to about 260 chars and we use
python -m webbrowser instead of running the full path to the module to
reduce the length of the target.

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* added menu and shortcut removal ability on MaxOSX and Linux

* removed registry path stuff on Windows, and hence pywin32 dependency

* add ability to have a menu icon on Linux <custom_tools>/menu.ico

* removed separate rh3 and rh4 modules

* simplified much of the code

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* This version has been used for a long time.


10 October, 2008 (DP):
- API: Finished refactoring that created the application_menus.py module
which allows data-driven creation of application menus for both KDE
and Gnome on RH3, RH4, and probably other modern Linux distributions.
The RH4 implementation creates application menu files that conform to
FreeDesktop.org's Desktop Menu Specification 1.0. Though users may
need to modify the application_menus.py module to get it to try that
implementation on another distribution or version.

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* Set CONDA_PREFIX environment variable in cwp.py, fix PATH

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* fix fallback to user-mode shortcut if elevation denied, 39