[EHPweb] WebApp Installer

[Eric M Martinez]

- All -

I've updated the web app installer script to use pre/post install  
hooks as well as an uninstall hook.  If you use either a pre/post  
install hook script, the installer then requires there also be an  
uninstall script.  All this is optional if you do not want/need any  
additional steps to install a web app.  In order to use this  
functionality you should create files in your app's "lib" directory as  
follows:

pre-install
	Run before linking or restarting Apache.

post-install
	Run after linking and restarting Apache.

uninstall
	Run in the event either of the install scripts fails or after  
unlinking and restarting Apache.

These hooks can be useful for system dependent configuration purposes  
or to compile code etc... They need to be executable but the language  
in which they are written does not matter. No arguments are passed to  
these scripts.  Please let me know if you have any questions.  These  
hooks are currently only on EHPDevel.  If we find this feature to be  
useful I will push the change to the other server.

Thanks,
	~Eric.


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