[Help-smalltalk] Package installation

[Gwenael Casaccio]

Hi,

In VisualGST when playing with packages, I've seen a strange behavior: 
The source code of methods was not correctly displayed. It  can happens 
when you've re-installed a package but not reload it. Because the source 
code position (FileSegment) is not correctly set and no more correct 
(the method is maybe removed). I've made a small fix, when installing a 
package I decompress it in a temporary directory (in ~\.st\...) and when 
leaving the vm I remove all the files.

The idea is for all gst create a session directory where all the 
packages will be loaded. Thus I've added a new primitive which call 
tempnam for creating a temporary dir. After I create a session directory 
for the current GST. And when we leave the vm it's destroyed (when 
calling update:) #aboutToQuit all the files and the directory are 
removed too.

Gwen

Session-Package.patch
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