compile-file: input path harmonized with load.

* share/txr/stdlib/compiler.tl (open-compile-streams): The
input file is now determined in a manner similar to the load
function.  If the path is relative and there is a *load-path*
binding, then it is now considered relative to *load-path*.
It is considered suffixed only if ending in .tl or
.txr. If unsuffixed, then it is first tried with the .tl
suffix.
(usr:compile-file): Bind *load-path* to the actual path used
for loading the file, rather than the input path.

* txr.1: Documented.

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