XSB Src (SVN)-old

Added call/[4-10] built-in predicates.

Updating make to accord with the pl->P changes to support dynamic loading of CLPR modules.

Changing .pl -> .P for some files to work better with the module
system. At some point, perhaps we should add .pl to some of the
dynamic loaders, or at least think seriously about it.

added test of precision for compiled float code -- I'll probably have to modify this for 64-bits.

loader_xsb.c - changed environment conflict message from an xsb_error
(a soft error) to a warning. Two things prompted me to do this.

First, this sort of soft error seems a bit confusing with our (mostly)
ISO-compatable notion of what an error is. Second, after emitting the
message, calls proceed correctly -- so a warning seems a better choice.

Added call/2 and call/3 in standard.

Also in eval, moved pi/1 and e/1 up from end_of_file so compiler can use it.

Adding weibull, exponential and normal distributins (manual doc added a day or two ago).

May have forgotten to commit this, it includes changes to allow constant functions like pi and e.

Changes in system.tex to describe the module system -- old description
was out of date in several respects. Also added several examples of
use.

Changed some description items so that standard predicates will appear
as such in the index.

Added descriptions of call/[2,3]

Fixed bug in compiler handling of goals of form Mod:Variable.
Also minor change in parenthesization in loader, for clarity.