rename vim_plugins_src to vim_plugin_candinates_src and used as an plugin candinate dir

vim_plugin_candinates_src/cscope-15.8a/README

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+Cscope is a text screen based source browsing tool.  Although it is
+primarily designed to search C code (including lex and yacc files), it
+can also be used for C++ code.
+
+Using cscope, you can easily search for where symbols are used and
+defined.  Cscope is designed to answer questions like:
+
+        Where is this variable used?
+        What is the value of this preprocessor symbol?
+        Where is this function in the source files?
+        What functions call this function?
+        What functions are called by this function?
+        Where does the message "out of space" come from?
+        Where is this source file in the directory structure?
+        What files include this header file?
+
+It has been released by The Santa Cruz Operation, Inc as Open Source
+under the BSD license.  Please look at COPYING for a detailed
+description of the license.
+
+For instructions on how to build and install cscope, see the file,
+"INSTALL".
+
+One thing to be pointed out is that this is ancient Unix software
+predating much of today's security concerns.  While we do try to
+address safety issues as we learn about them, it must be said that
+this is in no way hardened or secure software.  It's designed to be
+used by developers, not administrators or anonymous users.
+
+Browse to http://cscope.sourceforge.net for more current information
+