A "sdr" source-code patch for directory sessions

The file "patch.txt" contains a source-code patch for the "sdr" session browser, allowing it to properly handle directory SDP sessions.

This patch is to version 2.5.8 of the "sdr" source code, and contains minor changes to the C source files "bitmaps.c" and "sd_listen.c", and to the Tcl files "sdr.tcl", "plugins.tcl", "parsed_plugins.tcl", "new.tcl", "sap_crypt.tcl", "cache_crypt.tcl", and "cache_nocrypt.tcl". There is also a new C language file: "directory.xbm", to define a new 'directory' logo.

When rebuilt with this patch, "sdr" can now be used to:

launch a directory session, with each directory's contents appearing in a new window
create new session announcements (including directory session announcements) within any directory

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