User's home directory live on a server and every machine has  a link to it.  Very nice because you can move from 
computer to computer and have all your setttings.  There is however a small problem with that.  Helpviewer store 
information in ~/.ph/helpviewer but the format is not compatible between different version of Helpviewer ( 6.3.2/6.4.0/6
.4.1) causing problem if the same directory is used by different version.  Would it be possible for futur version to 
store the information in a per database format directory?

For example 
 ~/.ph/helpviewer_6.3.2
 ~/.ph/helpviewer_6.4.0
 ~/.ph/helpviewer_6.4.1.