Egg install locations (especially binaries) and standardized data dirs

[Daniel Ziltener]

Hi fellow hackers!

My intended fix of the NixOS package for Chicken has evolved into a task 
that is frustratingly somewhat bigger than that package. Currently, it 
looks like there are two "sub-issues" to it.

* the first issue is the installation location for egg binaries. 
Currently, to my knowledge, binaries get installed to the hardcoded 
location $CHICKEN_INSTALL_PREFIX/bin. It would be preferrable to make 
this adjustable, the same way the installation path of egg libraries 
are. My clunky first idea would be a variable 
$CHICKEN_INSTALL_BINARY_REPOSITORY. For backwards compatibility, it 
would probably make sense to set this to $CHICKEN_INSTALL_PREFIX/bin as 
a default, but letting users override it - e.g. to the standardized 
$HOME/.local/bin for user installations.

* the second issue is smaller and not as important; it concerns the 
search path for libraries. There was the suggestion that Chicken should 
check XDG_DATA_DIRS. I don't know those directories well, and it seems 
like XDG_DATA_DIRS does not contain libraries, but other shared 
resources by default, so I don't know how that fits the picture. 
Mentioning it here for completeness' sake.

zilti

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