[patch] Setup.exe choose.cc selection enhancement based on file existence

[Brian Keener <bkeener at thesoftwaresource dot com>]

Okay I will try this again.  The following change enhances the Setup.exe 
selection criteria for which files to show in the partial/full lists so 
that the selection criteria now include the installation method selected 
and the existence/non-existence of the installation file for each package 
as well as slightly different logic on Prev, Curr, and Test.  No,  the 
basic scheme still works they way it did.  The difference is what is 
displayed and whether they are shown as needing updating or if they 
default to skip or keep.  If I am in partial list then it comes up by 
default with current selected like it did and if I selected an install 
method of Netinstall then all packages with a current that is not 
currently installed would be displayed.  On the other hand if I selected 
download then only packages with a current version that is not 
installed and does not already exist on my local drive would be displayed 
for selection and if I selected install from local directory then only 
those whose current install file existed on disk and where the 
current version is not installed would be displayed.  This same logic 
follows if I then selected Prev or Test the selection list changes 
accordingly.

Sorry about the fact that I use and attachment but the code diff was 
bigger than my email would allow me to send  but here is the Changelog 
entry

2001-02-05  Brian Keener   <bkeener@thesoftwaresource.com>
        *  choose.cc (paint) : modified message for nothing to download  
        vs nothing to install/update.
        (list_click) : modified to skip versions in selection process if 
        installing from local directory and installation file does not   
        exist.  Also leaves Source Action set to N/A if the source file  
        does not exist and installing from local directory.
        (check_existence) : new method to check current existence of
        installation files based on selected installation method.
        (set_existence) : new method to set the current existence of 
        installation files based on selected installation method.
        (best_trust) : decision process modified for best trust to base 
        decision on current trust selected (IE: prev, curr, or test) and
        existence of file and installation method selected.
        (default_trust) : added logic to capture the current trust level 
        and the trust selected for the given package.
        (set_full_list) : expanded the decision criteria for displaying a 
        package in the selection list to include existence/non-existence 
        of the file and the selected installation method.
        (build_labels) : modified criteria for label addition to include
        installation method and file existence/non-existence.
        (create_listview) : modification to establish the trust on       
        packages before setting up the display list.  Also modification  
        to set Current trust button as the default.
        (dialog_cmd) : set response for Prev, Curr, Test button push to  
        perform a reset of the selection list as well as setting the     
        default trust.
        (scan2) : modification to use the new method get_package_version 
        and also enhanced handling of the build for the structures       
        package and extra.
        (get_package_version) : new method to provide for reusable code  
        for determining the package version from the file name for a     
        specified trust.
        (read_installed_db) : modification to use the new method 
        get_package_version and also enhanced handling of the build for  
        the structures package and extra.
        (do_choose) : modification for additional initialization of      
        package and extra structures.  Uses read_installed_db all the    
        time despite install method.  Enhancement and changes to output  
        display for expanded code meanings and clarified output for      
        packages and available versions in the setup.log.full log file.
        *  ini.h :  added install_exists and source_exists and 
        partial_list_display to the structure definition for package.
        *  res.rc (IDD_CHOOSE) : Modify to choose dialog such that Prev, 
        Curr, and Test pushbuttons become Radio Buttons instead thus     
        allowing the operator to better determine which is selected.

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