[PATCH] Do not clear the prev, curr and exp fields of packagemeta. Never.

[Houder]

Hi,

I have prepared a patch to setup.exe, but I do not know how to submit 
it. For
this reason. I have attached the result of 'git format-patch' to this 
message.

Please, submit this patch.

This patch rectifies

  - packagemeta::ScanDownloadedFiles (package_meta.cc), and
  - packagemeta::trustp (package_meta.h)

Clarification:
Class packagemeta has "fields" prev, curr, exp and installed, which in 
fact
represent the info from setup.ini/installed.db, and should never be 
cleared
therefore. _Currently_ these fields are cleared in ScanDownloadedFiles() 
in
order to notify that the tarball for the associated field is not 
available.
This is a mistake, as it destroys relevant info (e.g. the version number 
of
a version).
To ascertain whether or not the associated tarball is available, one 
should
invoke <field>.accesible().

Note: yes, "field" is type packageversion.

Regards,
henri
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