[Nel] Configure's options

[Cedric Valignat]

Hi All,


I've made some additions to the configure script.

It's now possible to desactivate the compilation and installation process of
some part of NeL (network, 3d, PACS, etc ...) by using configure's options
--disable-<module>.

Every dependance is managed. ex: if you desactivate the 3d, the X checking
and the Freetype checking will not block the configure script so there is
no more meeds to install them on your computer if you don't need them.

So if you decide to build only some server softs (like NeLNS) you may compile
only NeL Net, ex :

   $ ./configure --disable-3d --disable-pacs [...]


The default is :

   - misc
        default: Mandatory

   - net
        default: Enables
        desativate with: --disable-net

   - 3d
        default: Enable
        desativate with: --disable-3d

   - pacs
        default: Enable
        desativate with: --disable-pacs

   - sound
        default: Disable
        ativate with: --enable-sound

   - ai
        default: Disable
        ativate with: --enable-ai



Cedric.