[Tclplugin-core] somewhat functional make install

[Jeff H. <je...@Ac...>]

For those who have been wondering what to do with sources that don't
install, I've fixed make install to be a little more helpful.

The basics of making a built plugin operate for you is:

All platforms:
	run make install
	This copies the contents of tclplugin/library to whatever install
	dir you have chosen.  Whereever this goes, it must be on the
	auto_path of the wish dll (Windows) or wish binary that will be
	used.

	WINDOWS:
	Mozilla:
		Copy the build nptcl30.dll to Mozilla's PLUGINS dir.
		Probably C:/Progra~1/mozilla.org/Mozilla/Plugins
	IE 5.5sp1-:
		Copy the build nptcl30.dll to Mozilla's PLUGINS dir.
		Probably C:/Progra~1/Internet Explorer/PLUGINS
	IE 5.5sp2+:
		Copy dll as for 5.5sp1 above.
		You will also need the ActiveX NPAPI host control from:
			http://plugindoc.mozdev.org/windows.html
		You have to compile this yourself for now, as it also
		needs to register itself as a control.  Hopefully I can
		get a binary with install for this done soon.

	UNIX:
	All browsers:
		Copy libnptcl3.0.so to whereever plugins are expected, like:
		/opt/mozilla/plugins (Mozilla, site-wide)
		/usr/local/lib/netscape/plugins (Netscape4, site-wide)
		~/.netscape/plugins (Netscape4, personal)
		~/.mozilla/plugins (Netscape7 or Mozilla1+, personal)
		Edit installed /path/to/tcl/lib/nptcl3.0/installed.cfg
			set ::plugin(executable) to a valid, up-to-date 8.4
			wish binary.

Restart browser and go from there.
A good starting page is:
	http://www.tcl.tk/software/plugin/
and the Plugin Demos link.

At this time, any existing tclet should operate with the plugin, but I
am not commited to keeping that compatability, depending on what we do
to modify the security model.

  Jeff Hobbs                     The Tcl Guy
  Senior Developer               http://www.ActiveState.com/
      Tcl Support and Productivity Solutions